Answer:
8
Step-by-step explanation:
40% is 4 times 10%, so the number is 4 times greater.
4 × 2 = 8
Answer: 8
Let's call the number we're trying to find "x".
We know that 10% of x is equal to 2.
So, we can set up the equation:
0.1x = 2
To solve for x, we can divide both sides by 0.1:
x = 2 ÷ 0.1
x = 20
Now that we know x is 20, we can find 40% of that number:
40% of 20 = 0.4 x 20 = 8
Therefore, 40% of that number is equal to 8.
The figures shown are similar. What is the measure of side DE? 2 trapezoids. First trapezoid has points B, C, D, E. Distance from B to E (4.5 centimeters); B to C (6 centimeters); C to D (4.5 centimeters). Second trapezoid has points F, G, H, I. Distance from F to G (4 centimeters); G to H (3 centimeters); H to I (2 centimeters); F to I (3 centimeters). help me
The measurement of side DE is 3 centimeters.
What is the trapezoids?
A trapezoid is a 2D geometric shape that has four sides, with two sides parallel to each other and two sides non-parallel.
To solve this question, we can use the fact that similar figures have corresponding sides in proportion. Let's label the lengths of the sides of the trapezoids as follows:
First trapezoid: BE = 4.5 cm, BC = 6 cm, CD = 4.5 cm
Second trapezoid: FG = 4 cm, GH = 3 cm, HI = 2 cm, FI = 3 cm
Since the trapezoids are similar, we know that the ratio of corresponding sides is the same. Let's call this ratio k.
For the first trapezoid, the parallel sides are DE and BC, so we have:
k = DE / BC
For the second trapezoid, the parallel sides are FG and HI, so we have:
k = HI / FG
Since the trapezoids are similar, these ratios must be equal:
DE / BC = HI / FG
Substituting in the given lengths, we get:
DE / 6 = 2 / 4
Simplifying, we get:
DE = 3 cm
Therefore, the measurement of side DE is 3 centimeters.
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Write (10 + √2)÷(14+ √2) in the form a+b√2/c
where a, b and c are all integers.
Answer:
[tex]\frac{69+2\sqrt{2}}{97}[/tex]
Step-by-step explanation:
(10 + √2)÷(14+ √2)= [tex]\frac{10+\sqrt{2} }{14+\sqrt{2} }[/tex]
= [tex]\frac{(10+\sqrt{2}) x (14-\sqrt{2})}{(14+\sqrt{2}) x (14-\sqrt{2}) }[/tex]
= [tex]\frac{(10+\sqrt{2}) x (14-\sqrt{2})}{14^{2}-(\sqrt{2}^{2})}[/tex]
= [tex]\frac{{(10+\sqrt{2}) x (14-\sqrt{2})}}{196-2}[/tex]
= [tex]\frac{140-10\sqrt{2}+14\sqrt{2}-2}{194}[/tex]
= [tex]\frac{138+4\sqrt{2}}{194}[/tex]
= [tex]\frac{2 x (69+2\sqrt{2})}{194}[/tex]
= [tex]\frac{69+2\sqrt{2}}{97}[/tex]
∴ the answer is [tex]\frac{69+2\sqrt{2}}{97}[/tex] in the form [tex]\frac{a+b\sqrt{2}}{c}[/tex]
(10 + √2)÷(14+ √2) can be written in the form (69 + 3√2) ÷ 97, where a = 69, b = 3, and c = 97, and all are integers.
What are integers?A number that includes zero, positive numbers, and negative numbers, is an integer. Integer's can never be a fraction, a decimal, or a percent, it should be noted.
To write (10 + √2)÷(14+ √2) in the form a+b√2/c, we need to rationalize the denominator by multiplying both the numerator and denominator by the conjugate of the denominator, which is 14 - √2.
[(10 + √2) ÷ (14 + √2)] x [(14 - √2) ÷ (14 - √2)]
= [(10 + √2) x (14 - √2)] ÷ [(14 + √2) x (14 - √2)]
= [140 + 8√2 - 2√2 - 2] ÷ [196 - 2]
= (138 + 6√2) ÷ 194
= (69 + 3√2) ÷ 97
Therefore, (10 + √2)÷(14+ √2) can be written in the form (69 + 3√2) ÷ 97, where a = 69, b = 3, and c = 97, and all are integers.
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The marketing team of Yummy Cookies starts a promotion plan by giving one reward points card in each packet of cookies. It is found that 75% of the packets of Yummy Cookies contain 3‐point cards and the rest contain 7‐point cards. A total of 20 points or more can be exchanged for a gift coupon. Peggy buys 4 packets of Yummy Cookies and she opens them one by one.
a Find the probability that Peggy can exchange for a gift coupon.
The probability that Peggy can exchange for a gift coupon is 36.3%.
To find the probability that Peggy can exchange for a gift coupon, we need to calculate the probability that she obtains at least 20 reward points from the 4 packets she buys.
Let X be the total number of points Peggy obtains from the 4 packets. We can model X as a binomial random variable with n = 4 and p = 0.75, since 75% of the packets contain 3-point cards.
The probability mass function of X is:
P(X = k) = (4 choose a) * 0.75ᵃ* 0.25⁴⁻ᵃ, for a = 0, 1, 2, 3, 4
To find the probability that Peggy can exchange for a gift coupon, we need to calculate P(X >= 20). However, since the number of points in each packet is discrete and limited to 3 or 7, it is not possible to obtain exactly 20 points. Therefore, we need to find P(X >= 21).
P(X >= 21) = P(X = 21) + P(X = 22) + P(X = 23) + P(X = 24) + P(X = 25) + P(X = 26) + P(X = 27) + P(X = 28)
Using the binomial probability mass function, we get:
P(X >= 21) = (4 choose 3) * 0.75³ * 0.25 + (4 choose 2) * 0.75² * 0.25² + (4 choose 1) * 0.75 * 0.25³ + 0.25⁴
P(X >= 21) = 0.36328125
Therefore, the probability that Peggy can exchange for a gift coupon is approximately 0.363, or 36.3%.
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Nine less than four times a number equals fithteen
Answer:6
Step-by-step explanation:
let's write this as equation,
4x-9=15
4x=15+9=24
x=24/4=6
26. Complete the following proof. Given: \( \angle Q P S \cong \angle T P R \) Prove: \( \angle Q P R \cong \angle T P S \)
The proof of the congruence of the angles ∠QPS and ∠TPR is shown below
Completing the proofs of the anglesGiven that
∠QPS ≅ ∠TPR
We have the proof of the congruence of the angles ∠TPS and ∠QPR using the following two column style of proofs
Statements Reasons
a ∠QPS ≅ ∠TPR Given
b ∠QPS ≅ ∠TPR Given
c ∠QPS ≅ ∠QPR + ∠RPS Addition property
∠TPR ≅ ∠TPS + ∠RPS
d ∠TPR ≅ ∠QPR + ∠RPS Substitution
e ∠QPR + ∠RPS ≅ ∠TPS + ∠RPS Substitution
f ∠QPS ≅ ∠TPS Subtract property
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Complete question
Complete the following proof. Given: ∠QPS ≅ ∠TPR
Prove: ∠QPS ≅ ∠TPS
Statements Reasons
a ______________ ______________
b ∠QPS ≅ ∠TPR ______________
c ∠QPS ≅ ∠QPR + ∠RPS ______________
∠TPR ≅ ∠TPS + ∠RPS
d ______________ Substitution
e ______________ ______________
f ______________ ______________
Find the indicated area under the curve of the standard normal distribution; then convert it to a percentage and fill in the blank. About ______% of the area is between z=−3.5 and z=3.5 (or within 3.5 standard deviations of the mean).
99.96% of area lies between given value range under the curve.
We can use a standard normal distribution table or a calculator with a normal distribution function to determine the area under the curve of the standard normal distribution between z = -3.5 and z = 3.5. The difference between the area to the left of z = 3.5 and the area to the left of z = -3.5 is the area under the curve between these two numbers.
We determine the region to the left of z = 3.5 and z = -3.5 using a typical normal distribution table. Left of z = 3.5 is an area of 0.9998, whereas left of z = -3.5 is an area of 0.0002. Hence, the region between z = -3.5 and z = 3.5 is as follows:
0.9998 - 0.0002 = 0.9996
To turn this to a percentage, we multiply by 100:
0.9996 x 100 = 99.96%
In other words, 99.96% of the area is within 3.5 standard deviations of the mean, or between z = -3.5 and z = 3.5. This shows that most values in a normal distribution fall within a few standard deviations of the mean and accounts for a sizeable portion of the overall area under the curve.
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Alisa is choosing new tile for the floor in her dining room which is in the shape of a square with side lengths x feet. The tile costs $3. 39 per square foot
Th function is f(x) = 3.39x²
The cost of the flooring for a dining room is $410.19.
The cost of the flooring for a dining room is $6,072.31.
What is a function?
A function has an input and an output.
A function can be one-to-one or onto one.
It simply indicated the relationships between the input and the output.
Example:
f(x) = 2x + 1
f(1) = 2 + 1 = 3
f(2) = 2 x 2 + 1 = 4 + 1 = 5
The outputs of the functions are 3 and 5
The inputs of the function are 1 and 2.
We have,
Area of a square = side²
Square with side lengths = x feet.
The tile costs = $3.39 per square foot.
a.
The function f for the cost of the flooring.
f(x) = 3.39x²
b.
x = 11 feet
f(11) = 3.39 x 11²
f(11) = 3.39 x 121
f(11) = $410.19
c.
x = 23 feet
f(23) = 3.39 x 23²
f(23) = 3.39 x 529
f(23) = $6,072.31
Therefore,
f(x) = 3.39x²
The cost of the flooring for a dining room is $410.19.
The cost of the flooring for a dining room is $6,072.31.
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Complete Question
Alisa is choosing new tile for the floor in her dining room which is in the shape of a square with side lengths x feet. The tile costs $3.39 per square foot.
a. Write the function f for the cost of the flooring.
b. Determine the cost of the flooring if she decides on a dining room with side lengths of 11 ft.
c. Determine the cost of the flooring if she decides on a dining room with side lengths of 23 ft
Please ASAP Help
Will mark brainlest due at 12:00
Answer:
2
Step-by-step explanation:
-3x - 12 = 40 - 8x - 21x
-3x + 8x + 21x = 40 + 12
26x = 52
x = 52/26
x = 2
Answer:
x=-14/13, or -1 1/13
Step-by-step explanation:
A farmer has built circular pens for her animals behind the barn.
She needs to determine how far the center of each pen is from the barn in order to install
underground wiring for lights.
Here's what she knows:
The distance between the center of the cow pen and the center of the horse pen is 15 yards.
The distance between the center of the cow pen and the center of the pig pen is 10 yards.
All radii are whole numbers, and all are greater than 3 yards
No two pens are the same size.
She has labeled distances between the barn & points of tangency to the pens in her diagram.
You can help her decide which animal goes in which pen.
1. Now help her find the distance from the barn to the center of each pen! Show all of your work.
Use the page below for workspace as needed.
Distance from barn to center of...
Horse pen:
Cow pen:
Pig pen:
18.25
9.5 yds
+
75 yds.
Pig
COW
112248
8.75 yds.
24.75
horse
16 yds.
The distances from the barn to the center of each pen are: Horse pen: 47 yards , Cow pen: 50.25 yards , Pig pen: 64.75 yards.
Define Pythagorean theorem?The Pythagorean theorem states that in a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the lengths of the other two sides.
To solve for the distances from the barn to the center of each pen, we can use the following steps:
Draw a diagram of the situation, labeling the radii of each pen and the distances between the pens.
Use the Pythagorean theorem to solve for the radius of each pen. Let r1 be the radius of the horse pen, r2 be the radius of the cow pen, and r3 be the radius of the pig pen.
For the horse pen:
r1² = (15 + 16)² + (18)²
r1²= 961
r1 = 31 (rounded to the nearest whole number)
For the pig pen:
r3² = (10 + 24.75)² + (18)²
r3²= 1640.06
r3 = 40 (rounded to the nearest whole number)
Use the distance from the barn to the point of tangency of each pen to solve for the distance from the barn to the center of each pen. Let d1 be the distance from the barn to the center of the horse pen, d2 be the distance from the barn to the center of the cow pen, and d3 be the distance from the barn to the center of the pig pen.
For the horse pen:
d1 = 16 + r1
d1 = 16 + 31
d1 = 47 yards
For the cow pen:
d2 = 75 - r2
d2 = 75 - 24.75
d2 = 50.25 yards
For the pig pen:
d3 = 24.75 + r3
d3 = 24.75 + 40
d3 = 64.75 yards
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Find the area of the rhombus
If the length of one side of the rhombus is 6m and the radius of the rhombus as 4 m then the area of the rhombus is 24 m².
What is the area of the rhombus?
The Area of a Rhombus = A = ½ × d1 × d2,
Where d1 and d2 are the diagonals of the rhombus.
The area of a rhombus can be found using the formula:
Area = (diagonal 1 x diagonal 2) / 2
or
Area = (base x height) / 2
We are given the length of one side of the rhombus as 6 m, which means the length of the other side is also 6 m since all sides of a rhombus are congruent. We are also given the radius of the rhombus as 4 m, which is half the length of the diagonal.
Using the Pythagorean theorem, we can find the length of the other diagonal:
diagonal 2 = 2(radius) = 2(4) = 8 m
Now we can use the formula to find the area of the rhombus:
Area = (diagonal 1 x diagonal 2) / 2
Area = (6 m x 8 m) / 2
Area = 24 m²
Therefore, the area of the rhombus is 24 m².
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3) What is the translation rule that describes the result of the composition of (x, y) --> (x+4, y-1) and (x, y) --> (x-5, y-5)?
The composition of (x, y) --> (x+4, y-1) and (x, y) --> (x-5, y-5) is (x, y) --> ( x - 1 , y - 6).
What is Composition of transformation ?
Each transformation applied to the prior image is combined into a composition of transformations. The result of a translation is identical to a composition of reflections across parallel lines (twice the distance between the parallel lines)
Given :
1st Translation : (x, y) --> (x+4, y-1)
It means 4 units to the right and 1 unit down.
2nd Translation : (x, y) --> (x-5, y-5)
It means 5 units to the left and 5 units down.
Now, The composition will be as follows:
(x, y) --> ( x +4 -5 , y - 1 - 5)
(x, y) --> ( x - 1 , y - 6)
It means 1 unit to the left and 6 units down.
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When two dice are rolled, the total is between 2 and 12 inclusive. A student simulates the rolling of two dice by randomly generating numbers between 2 and 12. Does this simulation behave in a way that is similar to actual dice? Why or why not?
The simulatiοn dοes't behave in way that is similar tο actual dice because οf variatiοn οf prοbability.
What is prοbability?Prοbability is a way οf calculating hοw likely sοmething is tο happen. It is difficult tο prοvide a cοmplete predictiοn fοr many events. Using it, we can οnly fοrecast the prοbability, οr likelihοοd, οf an event οccurring. The prοbability might be between 0 and 1, where 0 denοtes an impοssibility and 1 denοtes a certainty.
a)The pοssible cοmbinatiοns frοm the twο dices tο get a tοtal οf seven are
=> (1,6) (2,5) (3,4) (4,3) (5,2) (6,1)
i.e. 6 cases and the tοtal nο. οf cοmbinatiοns
=>6 * 6 = 36.
Hence the nο. οf cases favοurable fοr us οut οf all the cοmbinatiοns is 6.
Hence the prοbability is 6/36 = 1/6.
b)To get a 7 out from a set of 2,12 inclusive is 1/11.
Because it is a choice of 1 no. from the 11 numbers available.
c). NO.
This simulatiοn dοesn't behave like the actual dice because in the secοnd case we are chοοsing οne number frοm the 11 available οptiοns whereas in the first case it is the prοbability οf chοοsing the 6 right cοmbinatiοns frοm the 36 cοmbinatiοns available.
i.e . Chοοsing 6 frοm 36 . hence the prοbability is 1/6.
whereas the chοice οf 1 frοm 11 . i.e prοbability is 1/11.
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100 points please help!!
Answer: (5x-1)(x+4)
Step-by-step explanation:what she said
Find the indicated real nth roots of a n=3, a=-125
The cube root of -1 is -1, and the cube root ∛(-125) is -5.
To find the real nth roots of a number a, we can use the formula:
[tex]√(a) = a^(1/n)[/tex]
For the case where n=3 and a=-125, we have:
[tex]√(-125) = (-125)^(1/3)[/tex]
We can simplify this using the fact that
[tex](-a)^(1/n) = -(a^(1/n)):[/tex]
√(-125) = - (√125)
Now we need to find the cube root of 125. We can factor 125 as 555, so:
√(-125) = - (√125) = - (√(555)) = - (5√5)
Therefore, the real cube root of -125 is -5√5.
The cube root of -125 is the real number x that satisfies the equation
[tex] {x}^{3} [/tex]
= -125.
We can rewrite -125 as -1*5^3, which means we can write the cube root of -125 as ∛(-1)*∛(5^3).
The cube root of -1 is -1, and the cube root of 5^3 is 5, so ∛(-125) = -1*5 = -5.
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A student writes down the following piece of work which contains an error in their reasoning. The equation is: y 2
−23y=0 Add 23y to each side: y 2=23y Divide each side By y : y=23 (i) Substitute y=23 into the left-hand side of the equation y 2−23y=0, and explain why this shows that y=23 is indeed a solution of the equation. (ii) Write out a complete solution of the equationy 2−23y=0. (iii) Explain, as if directly to the student, why their solution is inadequate. Solve the following equation, checking that your solution is correct: 6−x16 = x+356
The following are the answers:
(e) All the parts are discussed in step 2.
(f) The solution is x= 4 and the verification is shown below
How to solveGiven the equation y^2 - 23y = 0
We would follow the steps
Given the equation [tex]\frac{16}{6-x} = \frac{56}{x + y}[/tex]
We need to solve this and verify the solution
(e) (i) Substitute y = 23 on the left-hand side of the given equation.
23^2 -23(23) = 0
0 = 0
Since the left-hand side is equal to the right-hand side, hence y= 23 is the solution of the given equation, but it is not the only solution.
(ii) Complete solution of the given equation:
y^2 -23y = 0
y(y-23) =0
y= 0
and y -23 = 0
y = 0, 23
Hence the complete solution of the given equation is y= 0, 23
EXPLANATION
If a.b = 0, then a= 0, b=0
.
(iii) The solution is inadequate because we can cancel the term only if it non zero.
Also, the given equation has power 2, but the student is getting only a single value, which is incorrect.
Solve the given equation as follows:
[tex]\frac{16}{6-x} = \frac{56}{x + 3}[/tex]
16 (x +3)= 56(6-x)
= 2x + 6= 42- 7x
9x = 36
x= 4
Hence the required solution is x= 4
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The pictures show four wavelengths of sound.
on
wo
W
X
LO
commo
то
wwwwwww.
Y
O
Z
Which line shows the lowest frequency?
The line labelled “W” shows the lowest frequency of sound.
What is sound?Sound is a type of energy that is created by vibrations and travels through the air in the form of waves. Sound can only be heard when these waves enter the ear and vibrate the eardrum. The frequency of the sound wave determines the pitch of the sound. Sound is also used to communicate and can be manipulated to create music. It can be used to detect events and can travel through water and solid objects.
Frequency is a measure of how often a sound wave repeats itself over time. It is measured in hertz (Hz), which is the number of sound waves per second. The lower the frequency of a sound wave, the lower the pitch of the sound. The line labelled “W” shows the lowest frequency of sound, meaning it has the lowest pitch. The other lines show higher frequencies, meaning they have higher pitches.
The other lines show different frequencies of sound, each with its own pitch. Line “X” has a higher frequency than line “W”, but still lower than the other lines. Line “LO” has a higher frequency than “X”, but lower than the other lines. Line “Y” has a higher frequency than “LO”, but still lower than the other lines. Line “O” has the highest frequency and therefore the highest pitch among all of the lines.
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Executives of a supermarket chain are interested in the amount of time that customers spend in the stores during shopping trips. The executives hire a
statistical consultant and ask her to determine the mean shopping time, μ, of customers at the supermarkets. The consultant will collect a random sample of
shopping times at the supermarkets and use the mean of these shopping times to estimate μ. Assuming that the standard deviation of the population of
shopping times at the supermarkets is 28 minutes, what is the minimum sample size she must collect in order for her to be 95% confident that her estimate is
within 5 minutes of μ?
Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole
number that satisfies the requirements).
(If necessary, consult a list of formulas.)
Using the formula of margin of error for the confidence interval, the minimum sample size is 120
What is the minimum sample sizeWe can use the formula for the margin of error for a confidence interval:
margin of error = z* (standard deviation/√n)
where z* is the z-score for the desired confidence level.
For a 95% confidence interval, z* = 1.96. We want the margin of error to be 5, and we are given that the standard deviation of the population is 28. So we can solve for n:
5 = 1.96 * (28 / √n)
√n = 1.96 * 28 / 5
n = (1.96 * 28 / 5)²
n = 120.47
n = 120
The minimum sample size that will give a margin of error of 5 minutes with 95% confidence is 120.
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PLEASE HELP!!
Write an inequality for the following problem. Use W for your variable.
2 times a number increased by 23 is at most 70.
Answer:
Step-by-step explanation:
2W+23 is at most 70. So, 2W+23 must be less than or equal to 70.
2W+23≤70
Solve
2W≤47
W≤47/2 or W≤23.5
Raju & akash is given to solve a mathematical problem. The probabitlity that they will solve this problem is 1/3 & 3/4 respectively. Then, find the probability that both Raju & AKAsh will solve any random problem given to them after sufficient time
The probability that both Raju and Akash will solve any random problem given to them after sufficient time is 1/4.
The probability that Raju will solve a random problem given to him is 1/3 and the probability that Akash will solve the same problem is 3/4. We can use the multiplication rule of probability to find the probability that both of them will solve any random problem given to them after sufficient time.
According to the multiplication rule of probability, the probability of two independent events A and B occurring together is the product of their individual probabilities:
P(A and B) = P(A) × P(B)
In this case, the event "Raju solves a problem" is independent of the event "Akash solves a problem". Therefore, the probability that both Raju and Akash will solve a random problem given to them after sufficient time is:
P(Raju and Akash) = P(Raju) × P(Akash)
= 1/3 × 3/4
= 1/4
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Every morning, Matthew ills his dog’s water dish with 16 oz of water. If his dog finishes his water every day, how many ounces will his dog drink in a week?
How many cups is this?
How many pints is this?
How many quarts is this equal to?
How many quarts is this?
The dog drinks 112 ounces, or 14 cups, or 7 pints, or 3.5 quarts of water per week.
How to find intake of the dog?The dog drinks 16 oz of water every day, so in a week (7 days), the dog will drink:
16 oz/day × 7 days/week = 112 oz/week
To convert ounces to cups, we divide by 8 (since there are 8 fluid ounces in a cup):
112 oz/week ÷ 8 oz/cup = 14 cups/week
To convert ounces to pints, we divide by 16 (since there are 16 fluid ounces in a pint):
112 oz/week ÷ 16 oz/pint = 7 pints/week
To convert ounces to quarts, we divide by 32 (since there are 32 fluid ounces in a quart):
112 oz/week ÷ 32 oz/quart = 3.5 quarts/week
Therefore, the dog drinks 112 ounces, or 14 cups, or 7 pints, or 3.5 quarts of water per week.
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Fill in the blank question.
The table shows the distance a runner has traveled y, in miles, x minutes after the start of a race. What is the runner's average rate of change, in miles per minute, from 60 to 120 minutes?
Time (min) Distance (miles)
0 0
30 3.48
60 6.42
90 9.18
120 12.0
According to the speed formula, the runner's average rate of change from 60 to 120 minutes is approximately: 5.58 / 60 = 0.093 miles per minute
What is speed?
Speed is defined as the distance travelled by an object in a given amount of time. Speed is a scalar quantity, meaning that it has magnitude but no direction.
Mathematically, speed is calculated as follows:
speed = distance / time
where "distance" is the distance travelled by the object, and "time" is the time it takes for the object to travel that distance.
The average rate of change of a function over an interval is the slope of the secant line between the endpoints of the interval.
In this case, we want to find the average rate of change of the distance function from 60 to 120 minutes. The distance function is given by the table as:
Time (min) Distance (miles)
0 0
30 3.48
60 6.42
90 9.18
120 12.0
To find the average rate of change from 60 to 120 minutes, we need to calculate the slope of the secant line passing through the points (60, 6.42) and (120, 12.0).
The slope of the secant line is given by:
slope = (change in y) / (change in x) = (12.0 - 6.42) / (120 - 60) = 5.58 / 60
Therefore, the runner's average rate of change from 60 to 120 minutes is approximately: 5.58 / 60 = 0.093 miles per minute
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What type of shape is the box of Cremora
The box of Cremora is typically rectangular in shape, with six rectangular faces and twelve edges.
On Saturday mornings, Ronald volunteers at the hospital where his mother works. One Saturday, he answers phone calls at the information desk while the receptionist is away. Then he spends 40 minutes delivering flowers to patients' rooms. In all, Ronald volunteers at the hospital for 90 minutes that day. Which equation can you use to find the amount of time , that Ronald answers phone calls?
Ronald spent 50 minutes answering phone calls on Saturday morning. The equation used to find this value is x + 40 = 90.
Let's assume that Ronald spent "x" minutes answering phone calls. We know that he spent a total of 90 minutes volunteering, and 40 minutes delivering flowers. So the time he spent answering phone calls and delivering flowers can be expressed as:
x + 40
We also know that the total time he spent volunteering was 90 minutes. So we can write:
x + 40 = 90
To solve for "x", we can subtract 40 from both sides of the equation:
x + 40 - 40 = 90 - 40
Simplifying:
x = 50
where x represents the amount of time Ronald spent answering phone calls.
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can someone explain how to solve this question with steps
First we need to find the inverse function. To do this, I'd put f(x) into vertex form:
[tex]\begin{aligned}f(x) &= (x^2-4x)-6\\[0.5em] &= (x^2-4x+4)-6-4\\[0.5em] &= (x-2)^2-10\\[0.5em]\end{aligned}[/tex]
Now, we can try to invert the function, keeping in mind this is only used when x≥2.
[tex]\begin{aligned}y&= (x-2)^2-10\\[0.5em]y+10&= (x-2)^2\\[0.5em]\sqrt{y+10}&= x-2\\[0.5em]\sqrt{y+10}+2&= x\\[0.5em]\end{aligned}[/tex]
(The fact that x ≥ 2 allowed us only keep the positive square root on the third line.)
So our inverse function is [tex]f^{-1}(y)=\sqrt{y+10}+2[/tex].
Now, let's find the derivative of this function:
[tex]\begin{aligned}\dfrac{df^{-1}}{dy}&= \dfrac{1}{2\sqrt{y+10}}\cdot\dfrac{d}{dy}[y+10]\\[0.5em] &= \dfrac{1}{2\sqrt{y+10}}\end{aligned}\\[/tex]
(The chain rule was used, but the derivative of the inside function equals 1.)
So [tex](f^{-1})'(-6) = \dfrac{1}{2\sqrt{-6+10}} = \dfrac{1}{4}[/tex]
Now having done all of that, it did cross my mind that since [tex]f[/tex] and [tex]f^{-1}[/tex] are simply reflections over the line y=x, if we had actually just found f'(4) and then used the reciprocal slope, we'd also get the same answer more quickly.
f'(x) = 2x - 4
when y = -6, then x = 4 (by solving f(x) = -6).
f'(4) = 4, so reflecting that slope of 4/1 over the line y=x, we'd get a slope of 1/4.
III. Three fair tetrahedra (same as the one in part II except (magenta; green; red)) are tossed. Find the prob's of: a. All the same Greek letter. b. No γ 's nor δ 's. c. Exactly two β 's. d. All different Greek letters.
Answer:
d all differet grreek letters
Question 5, please help
5/10
Answer:
1.5 gallons per minute
Step-by-step explanation:
To solve this question we have to figure out how much water there was in every time scale calculated. To do this we simply have to divide both values...
12 ÷ 8 = 1.59 ÷ 6 = 1.56 ÷ 4 = 1.53 ÷ 2 = 1.5We don't need to figure out the 0 as no time has passed for water to fill up!
We can see that for each one the answer is 1.5, so our average rate would be 1.5 gallons per minute!
Hope this helps, have a lovely day! :)
Lily is practicing multiplying complex numbers using the complex number (2+i).
To determine the value of (2+i)²,Lily performs the following operations:
Step 1: (2+i)²= 4+i²
Step 2: 4+i² = 4+ (−1)
Step 3: 4+(-1)=3
Lily made an error.
Explain Lily's error and correct the step which contains the error.
Bonus:
Lily is continuing to explore different ways in which complex numbers can be multiplied so the
answer is not a complex number. Lily multiplies (2+i) and (a+bi), where a and b are real
numbers, and finds that her answer is not a complex number.
A. Write an equation that expresses the relationship between a and b.
Lily's error is in the first step, (2+i)^2 ≠ 4 + i^2.
(2+i)^2 = (2+i)(2+i) and you need to FOIL.
(2+i)^2 = (2+i)(2+i)
= 4 + 2i + 2i + i^2
= 4 + 4i + (-1)
= 3 + 4i
Bonus:
If you want to multipy (2+i) by (a+bi) and not end up with a complex number, you'd first FOIL
(2+i)(a+bi) = 2a + 2bi + ai + bi^2
We know i^2 = -1, so this becomes
= 2a + 2bi + ai + b(-1)
= 2a + 2bi + ai - b
= 2a - b + 2bi + ai
Now, for this not to be complex, we need the imaginary pieces to cancel each other out. In other words 2bi+ai=0. For that to happen, 2b + a = 0, or
2b = -a or a = -2b
So it would seem that if we pick any b-value and make a = -2b, then we'll end up with a non-complex number.
Let's try b=5, making a = -10
(2+i)(-10+5i) = -20 + 10i - 10i + 5i^2
The 10i's cancel and 5i^2 = -5, so we're left just with -25.
Robyn tossed a two-color chip counter 3 times. One side of the chip counter is red, the other side is yellow. Which tree diagram shows all the possible outcomes, where R represents red and Y represents yellow?
In this case, there are 2 outcomes for each toss, so there are 2³ = 8 possible outcomes in total.
What is tree diagram?A tree diagram is a visual tool used to represent a set of possible outcomes or decisions in a systematic way, branching out from a central point.
Here is the tree diagram showing all the possible outcomes for tossing a two-color chip counter three times:
R Y
/ | \
R R Y
/ \ / \ /
R Y R Y R Y
Each branch represents a single toss of the chip counter, with the two possible outcomes represented by the two branches extending from each node.
The outcome of each toss is independent of the outcome of the other tosses, so the total number of possible outcomes is the product of the number of outcomes for each toss.
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Can you solve for the other x please
The solution to the inequality is: x >= 55 or x <= -32.
what is inequality?
An inequality is a mathematical statement that compares two values or expressions and indicates that they are not equal. In other words, an inequality shows the relationship between two values or expressions that are not the same.
To solve the inequality, we need to isolate x on one side of the inequality symbol in each of the two inequalities.
For the first inequality:
3 - 2/5 * x <= -19
Subtracting 3 from both sides, we get:
-2/5 * x <= -22
Dividing both sides by -2/5 (which is the same as multiplying both sides by -5/2), we get:
x >= 55
For the second inequality:
-3/4 * x >= 24
Dividing both sides by -3/4 (which is the same as multiplying both sides by -4/3), we get:
x <= -32
Therefore, the solution to the inequality is:
x >= 55 or x <= -32.
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A rectangular pool has dimensions 3x feet by 2x feet The deck around the pool is 5 feet wide.
The area of the pool alone in standard form is: ___
square feet
The area of the pool and deck together is: ___
square feet
Use ^ for exponent. Do not add spaces.
Step-by-step explanation:
Pool area = L x W = 3 x * 2x = 6x^2 ft^2
Pool + deck = (L+10)(W+10) = (3x+10)(2x+10) = 6x^2 + 50x + 100 ft^2