where is the problem, how can I help you?
Solve the following system of equations.
5 a-b=17
3 a+2 b=5
Answer:
a = 3 , b = - 2
Step-by-step explanation:
5a + b = 17 → (1)
3a + 2b = 5 → (2)
multiplying (1) by 2 and adding to (2) will eliminate b
10a + 2b = 34 → (3)
add (2) and (3) term by term to eliminate b
13a + 0 = 39
13a = 39 ( divide both sides by 13 )
a = 3
substitute a = 3 into either of the 2 equations and solve for b
substituting into (1)
5(3) + b = 17
15 - b = 17 ( subtract 15 from both sides )
- b = 2 ( multiply both sides by - 1 )
b = - 2
then solution is a = 3 , b = - 2
The intensity of sound is measured on the decibel scale, dB. The equation
dB 10 log I represents the decibel level, where I is the ratio of the sound to
the human hearing threshold. A noise registers a decibel level of 29. What is the
value of I? Round to the nearest whole number.
A) 42071
B) 18
C) 89
D) 794
Answer: D) 794
Step-by-step explanation:
[tex]10lgI=29[/tex]
Divide both parts of the equation by 10:
[tex]lgI=2.9\\\\I=10^{2.9}\\\\I\approx794[/tex]
A (4,2) and B (6,0) answer m=
Answer: 4 − 1 = 3
Step-by-step explanation: 6 - 2 = 4 32 + 42 = 25 4 − 1 = 3
Find the partial sum sn of the geometric sequence that satisfies the given conditions. a3 = 36, a6 = 288, n = 5
The value of the partial sum of geometric sequence with terms a3 = 36 and a6 = 288 is given by 297. This is obtained by using the concept of partial sum of a geometric progression.
What is geometric progression?
Geometric progression is defined as a series of numbers having a fixed ratio between each term and its preceding term. It is also known as a geometric sequence or G.P., and is exemplified as a1, a2, a3, ….., an
Here, the first term is denoted by a1 and its common ratio is shown by r, which is calculated using the formula a2 by a1. The partial sum of a G.P. is given by a1 ( rn - 1 ) / ( r - 1 ), when r > 1 and a1 ( 1 - rn ) / ( 1 - r ), when r < 1
Calculation of the partial sum of the geometric sequence that satisfies the given conditions. a3 = 36, a6 = 288, n = 5
Given:
Value of a3 = 36
Value of a6 = 288
n = 5
a3 = ar2 — 1
a6 = ar5
Now, a6 / a3 = ar5 / ar2 = 288 / 36
r3 = 8
Taking cube root both sides, we get,
r = 2
Putting the value of r in equation 1,
a3 = a(2)2
36 = 4a
a = 9
As r > 1, using the formula for Sn as a(rn - 1) / (r - 1)
Sn = 9(2n - 1) / (2 - 1)
Sn = 9(2n - 1)
Using n = 5, we have,
Sn = 9[(2)5 - 1]
Sn = 9(32 - 1)
Sn = 9 × 33
Sn = 297
Hence, the value of the partial sum of a G.P. is 297
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What calculation estimates the primary macronutrient the body uses for energy at a given point in time?
The calculation that estimates the primary macronutrient the body uses for energy at any given point in time is the Catabolic quotient.
What is the Catabolic quotient?The Catabolic quotient is used to show the amount of macronutrients that are being catabolized to produce energy at any given time.
This allows us to know how much macronutrients the body needs depending on the activities that a person is engaged in at the time. This is important for nutritional requirements as a result.
Options for this question are:
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QUESTION 10
ST lies on the coordinate plane with S located at (3,2).
The midpoint of ST is Z at (3,5).
Where is endpoint T located?
OA. (3, 3.5)
OB. (3, 8)
C. (3, 7)
OD. Not enough information.
The bottles of soda are sold to the student council in a box weighing 24 pounds. if there are 60 bottles in the box, How much does each bottle of soda weigh
Answer:
2.5 60÷24=2.5 so there is ur answer hope it helps
harold, tanya, and ulysses paint a very long picket fence. harold starts with the first picket and paints every h th picket; tanya starts with the second picket and paints every t th picket, and ulysses starts with the third picket and paints every u th picket. call the positive integer 100h 10
The possible triples are: (3, 3, 3), (4, 2, 4) as seen by counting theorem.
What is counting theorem?The basic counting principle is a method for keeping track of all the potential outcomes in a situation. According to this statement, there are n m n times m n methods to carry out both of these acts if there are n ways to execute one activity and m ways to perform another action after that.Now, by the counting principle,
Give the pickets numbers like 1, 2, and so on. If Picket 4 is painted, Ulysses must also paint the remaining Pickets. Let's say Harold paints picket number 4. If Harold and Ulysses both paint picket 7, Ulysses is unable to paint picket 5, so Tanya does. The picket is painted by Ulysses, and (h, t, u) = (3, 3, 3). However, let's say Tanya paints picket 4. Harold paints picket 5 since Ulysses is unable to do so or then there won't be anything left to paint. Ulysses paints picket 7 as a result, and (h, t, u) = (4, 2, 4).Hence, the possible triples are: (3, 3, 3), (4, 2, 4).
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starting with the number 0, build a sequence of 5 numbers
Answer:
0,-1 , -2 ,-3 ,-4 ,-5
Step-by-step explanation:
i think this is the answer but i can't confirm because your theory and my theory can be different
let me know if this was helpful
Write an expression for the operation described below.
7 times u
Square root of 20 greater, less then or equal to 4
Why could the mean of the data set below be misleading?
ages of teachers: 29, 38, 39, 26, 29, 29, 39, 77, 38, 29
The mean of the data set is 37.30
The mean of teachers ages are 37.30.Given that
Ages of teachers:29, 38, 39, 26, 29, 29, 39, 77, 38, 29
To find
The Mean of teachers ages ?So, according to the question
We have,
Ages of teachers: 29, 38, 39, 26, 29, 29, 39, 77, 38, 29So, we know that
The mean of any given datamean = [tex]\frac{sum\;of\;\;data}{number\;of\;data}[/tex]
So, the sum of the teachers ages∑ Ta = 29+ 38+ 39+ 26+ 29+ 29+ 39+ 77+ 38+ 29
∑ Ta = 373
The number of teachersTn = 10
Now, The Mean of teachers ages
Tm = [tex]\frac{sum\;of\;the\;teachers\;ages}{number\;of\;teachers}[/tex]
Tm = [tex]\frac{T_a}{T_n}[/tex]
= [tex]\frac{373}{10}[/tex]
Tm = 37.30
The mean of teachers ages are 37.30.
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(2,-4), (4,-5)
5x+2y^2=70
approximately 2000 tires are recycled to produce one lane-mile of asphalt rubber
A) The expression for the number of tires used to make x lane-miles of asphalt rubber is y = 2000x.
B) The number of tires used to make 11, 50, and 150 lane-miles of asphalt rubber are as follows:
y = 22000
y = 100000
y = 300000
How to create algebraic equations?
Approximately 2000 tires are recycled to produce one lane-mile of asphalt rubber.
Therefore, an expression for the number of tires used to make x lane-miles of asphalt rubber is as follows:
y = 2000x
where;
x = number of lanes-miles
y = number of tires
Therefore, the number of tires used to make 11, 50, and 150 lane-miles of asphalt rubber are as follows:
y = 2000(11) = 22000
y = 2000(50) = 100000
y = 2000(150) = 300000
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Complete question is;
Approximately 2000 tires are recycled to produce one lane-mile of asphalt rubber.
A.Write an expression for the number of tires used to make x lane-miles of asphalt rubber.
B. Find the number of tires used to make 11, 50, and 150 lane-miles of asphalt rubber.
pls help …………………?………….
Answer:
The Last box. (y=1/2x-4)
Step-by-step explanation:
The formula is y=mx+b
b is the interception point on the y axis.
So the -4 is where the line crosses on the y axis.
mx is how many spaces it goes up or down.
If you look the box goes up or down twice then left or right once.
So that's your answer, hope this helps.
The diagram shows eight identical squares inside a rectangle.
The length of the rectangle is 30 cm.
Work out the width of the rectangle.
Optional working
Answer: width =
+
cm
The width of rectangle is 20 cm
As is seen in the picture, there are 6 squares at the length of rectangle and 4 squares at the width of rectangle. Also, as per the known fact, each side of square is same. So, we will find the side of square to calculate width of rectangle.
Length of rectangle = 6 × side of square
Side of square = 30 ÷ 6
Side of square = 5 cm
Width of rectangle = 4 × side of square
Width of rectangle = 4 × 5
Width of rectangle = 20 cm
Hence, the width of rectangle is 20 cm.
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We wish to test the hypothesis that the mean weight of a population of fish is 140g. With sigma=15 g and alpha= 0.05, and a sample of 36 fish, find a) the mean values which would lead to a rejection of the hypothesis and Use a two-tailed test.
Using the z-distribution, it is found that mean weights less than 135.1g and more than 144.9 would lead to a rejection of the hypothesis.
What is the critical value of the test?We have a two-tailed test, with a significance value of α = 0.05, hence, using a z-distribution calculator, the critical value is given by:
|z| = 1.96 -> z < -1.96 or z > 1.96.
What is the test statistic?The test statistic is given as follows:
[tex]z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}[/tex]
In which:
X is the sample mean.[tex]\mu[/tex] is the value tested at the null hypothesis.[tex]\sigma[/tex] is the standard deviation of the population.n is the sample size.For this problem, the parameters are given as follows:
[tex]\mu = 140, \sigma = 15, n = 36[/tex]
The lower bound of acception is found as X when z = -1.96, hence:
[tex]z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}[/tex]
-1.96 = (X - 140)/(15/6)
-1.96 = (X - 140)/(2.5)
X - 140 = -1.96 x 2.5
X = 135.1.
The upper bound of acception is found as X when z = 1.96, hence:
[tex]z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}[/tex]
1.96 = (X - 140)/(15/6)
1.96 = (X - 140)/(2.5)
X - 140 = 1.96 x 2.5
X = 144.9.
Hence:
Mean weights less than 135.1g and more than 144.9 would lead to a rejection of the hypothesis.
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PLEASEE HELP!!!!
If a1 = 10 and an = an - 1 + 1 then find the value of a4
Answer: 13
Step-by-step explanation:
an=a(n-1)+1
a1=10
a2=
a(2-1)+1=
a1+1=
10+1=11
a3=
a2+1=
11+1=12
a4=
a3+1=
12+1=13
a4=13
pls help me ASAP
show all solutions
Answer:
Hello,
Step-by-step explanation:
I can only explain in mathematics not in English (i am French).
c: number of customers
n: number of good reviews
k: factor of proportionality
1)
p=k*c*n
15000=k*75*100 ==> k=2
if c=250 and n=150 then p=2*250*150=75000
2)
A=b*a/2 since b= 9 and a=4 then 9*4/2=18 (cm²)
A=4*7/2=14 (cm²)
-24 ≤ 2x-10 <-6 how to solve for x
Answer:
SOLVE FOR X
x∈[−7,8)
step explanation:
there is no solve for x just straight answer
in geometry what is n = 1
() Which number is closest to √88 ?
9.8
10.1
9.3
8.5
Answer:
9.3
Step-by-step explanation:
9.3 squared = 86.49
9.8 squared = 96.04
8.5 squared = 72.25
10.1 just gonna be higher
stuck on this question
Answer: itll be less than 3/4 pound
Step-by-step explanation:
the amount of watermelon would be 1.5/4 or 3/8. this is because all of the recipe would be divided by 2
Answer:
less than 3/4 pound
Step-by-step explanation:
What is 0.005 6 in standard form
The standard form of the given number is (5 × 10⁻³)/6.
What do we mean by standard form?The standard form of a number is a method of writing the number that adheres to certain rules. Standard form refers to any number that can be written as a decimal number between 1.0 and 10.0 multiplied by a power of ten.The standard form of 0.005/6 is:
= 0.005/6= (5/1000)/6= (5/10³)/6= (5 × 10⁻³)/6Therefore, the standard form of the given number is (5 × 10⁻³)/6.
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7. Solve the following: 10,400,000 - 8,200,000 Write your answer in scientific notation.
Answer:
2,200,000=2.2x10^6
Step-by-step explanation:
irections: use the strategies we practiced in class.
..) You are making 20 mint chocolate bars and 24 caramel pecan bars for some gift boxes. If each box contains the same
ars, what is the greatest number of gift boxes you can put together?
2.) How many mint chocolate and caramel bars will be in each gift box?
a) The greatest number of gift boxes that can be put together is 4.
b) Number of mint chocolate in gift box = 5
Number of caramel pecan bars in gift box = 6
Highest common factor or greatest common factor of two number is the greatest factor that divides the numbers.
According to the question we have been given that
number of mint chocolate = 20
number of caramel pecan bars = 24
a) We have to find the greatest number of gift boxes. For that we will find H.C.F of 20 and 24.
Factors of 20 = 2 * 2 * 5
Factors of 24 = 2 * 2 * 2 * 3
The H.C.F is 4 as it is the greatest that divides the two numbers.
Thus the greatest number of gift boxes that can be put together is 4
b) Number of mint chocolate in gift box = 20/4 = 5
Number of caramel pecan bars in gift box = 24/4 = 6
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the degree of correlation among independent variables in a regression model is called . a. multicollinearity b. the coefficient of determination c. interaction d. the sum of squared errors (sse)
Multicollinearity refers to the degree of correlation among independent variables in a regression model.
What is Multicollinearity?In a multiple regression model, one predictor variable can be predicted linearly from the others using a high degree of accuracy when there is a phenomenon known as multicollinearity (also known as collinearity). In this case, minor adjustments to the model or the data may cause the multiple regression's coefficient estimates to fluctuate unpredictably. Multicollinearity only impacts calculations pertaining to specific predictors; it has no impact on the predictive capability or reliability of the model as a whole, at least within the sample data set. In other words, a multivariate regression model with collinear predictors can show how well the complete set of predictors predicts the outcome variable, but it could not provide accurate information about any particular predictor or which predictors are redundant in relation to others.
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3
3
−10+7=3, cubed, minus, 10, plus, 7, equals
Answer:
10+ 7 is equal to 17 cube is the answer
NEED HELP ASAP ALSO READ PART A AND PART B
she made an error in the third step. The correct answer is - 9.7b + 25
How to add linear expression?(-4.23b + 13) - (5.47b - 12)
Therefore, let's open the bracket on the right side.
-4.23b + 13 - 5.47b + 12
Hence, let's combine the like terms
-4.23b + 13 - 5.47b + 12
-4.23b - 5.47b + 12 + 13
Do the arithmetic of the like terms
-4.23b - 5.47b + 12 + 13
- 9.7b + 25
Therefore, she made an error in the third step.
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ZA and ZB are vertical angles. If mA = (5x + 1)° and m/B = (4x + 3)°,
then find the value of x.
Answer:
x=2
Step-by-step explanation:
Vertical angles are equal.
5x+1=4x+3
-1 -1
5x=4x+2
-4x -4x
1x=2
x=2
The value of x is 2.
5(2)=4(2)+2
10=8+2
10=10
Hope this helps.