Solve. Your answer should be in simplest form. 2/5 (−3/7)
Answers
Answer:
2/5 (-3/7) = -6/35 ≅ -0.1714286
Step-by-step explanation:
and that’s how you do it
Add: 2/5 + 3/7 = 2 · 7/5 · 7 + 3 · 5/7 · 5 = 14/35 + 15/35 = 14 + 15/35 = 29/35.
It is suitable to adjust both fractions to a common (equal, identical) denominator for adding, subtracting, and comparing fractions. The common denominator you can calculate as the least common multiple of both denominators - LCM(5, 7) = 35. In practice, it is enough to find the common denominator (not necessarily the lowest) by multiplying the denominators: 5 × 7 = 35. In the following intermediate step, it cannot further simplify the fraction result by canceling.
In other words - two fifths plus three sevenths is twenty-nine thirty-fifths.
Related Questions
Adam is working in a lab testing bacteria populations. After starting out with a population of 390 bacteria, he observes the change in population and notices that the population quadruples every 20 minutes.Step 2 of 2 : Find the population after 1 hour. Round to the nearest bacterium.
Answers
The given information is:
The starting population of bacteria is 390.
The population quadruples every 20 minutes.
To find the equation of the population in terms of minutes, we can apply the following formula:
[tex]P(t)=P_0\cdot4^{(\frac{t}{20})}[/tex]Where P0 is the starting population, the number 4 is because the population quadruples every 20 minutes (the 20 in the power is given by this), it is equal to 4 times the initial number, and t is the time in minutes.
If we replace the known values, we obtain:
[tex]P(t)=390\cdot4^{(\frac{t}{20})}[/tex]To find the population after 1 hour, we need to convert 1 hour to minutes, and it is equal to 60 minutes, then we need to replace t=60 in the formula and solve:
[tex]\begin{gathered} P(60)=390\cdot4^{(\frac{60}{20})} \\ P(60)=390\cdot4^3 \\ P(60)=390\cdot64 \\ P(60)=24960\text{ bacterias} \end{gathered}[/tex]Thus, after 1 hour there are 24960 bacterias.
Find x, for which 7x+8=4x-10
Answers
We are given the equation 7x+8=4x-10 and we want to find the value of x, such that the equality holds. To do so, we will start with the equation and the solve it for x. That is, we will apply mathematical operations on both sides of the equation, so we end up "ilosating" the x on one side of the equality sign. We start by
[tex]7x+8=4x\text{ - 10}[/tex]First, we subtract 4x on both sides, so we get
[tex]\text{ -10=(7x-4x)+8=3x+8}[/tex]Now, we subtract 8 on both sides, so we get
[tex]3x=\text{ -10-8=-18}[/tex]Finally, we divide both sides by 3, so we get
[tex]x=\frac{\text{ -18}}{3}=\text{ -6}[/tex]so x=-6.
Determine whether each linear function is a direct a variation. If so, state the constant of variation. If not, explain why notI need help for number 6
Answers
In direct variation function, variables x and y are related by the next formula:
y = kx
where k is the constant of variation.
Isolating k for the above formula, we get:
k = y/x
Computing y divided by x with the values of the table:
[tex]\frac{5}{10}\ne\frac{6}{11}\ne\frac{7}{12}\ne\frac{8}{13}[/tex]Given that all the quotients are different, then the linear function is not a direct variation
Consider the following expression 9x+4y + 1 Select all of the true statements below 1 is a constant. 9x and 1 are like terms. 9x is a factor, 9x + 4y + 1 is written as a sum of three terms. ( 9x is a coefficient. None of these are true.
Answers
ANSWER:
1st option: 1 is a constant
4th option: 9x + 4y + 1 written as a sum of three terms
STEP-BY-STEP EXPLANATION:
We have the following equation:
[tex]9x+4y+1[/tex]From the following equation we can say the following:
• The only constant term is 1
,• None of the terms are similar
,• There are a total of 3 terms
,• The coefficients are 9 and 4
,• The factors are 9, 4, 1, x and y
From the above we can affirm that the true statements are:
• 1 is a constant
• 9x + 4y + 1 written as a sum of three terms
If the point (-6, 4) is dilated by a scale factor of 1/2, the resulting point is (-3,2).TrueFalse
Answers
(-6,4)
Multiply each coordinate by 1/2
( -6 * 1/2 , 4 * 1/2) = (-3,2)
True
Based on the degree of the polynomial f(x) given below, what is the maximum number of turning points the graph of f(x)
can have?
f(x) = -3+x²-3x - 3x³ + 2x² + 4x4
Answers
The maximum number of turning points based on the degree of the polynomial is 2.
What is the turning point?A polynomial function is a function that can be expressed in the form of a polynomial. The definition can be derived from the definition of a polynomial equation. A polynomial is generally represented as P(x). The highest power of the variable of P(x) is known as its degree.A turning point is a point in the graph where the graph changes from increasing to decreasing or decreasing to increasing.Turning point = n-1, where n is the degree of the polynomial.
The highest order of the polynomial is 3.n = 3Turning point = 3 - 1 = 2Therefore, the maximum number of turning points based on the degree of the polynomial is 2.
To know more about a turning point, visit:
brainly.com/question/14332783
#SPJ9
What is 10/12 written in simplest form?
Answers
ANSWER:
[tex]\frac{5}{6}[/tex]STEP-BY-STEP EXPLANATION:
We have the following fraction
[tex]\frac{10}{12}[/tex]Now to reduce to its simplest form, we must simplify
[tex]\frac{2\cdot5}{2\cdot6}=\frac{5}{6}[/tex]Write an expression in terms of Pi that represents the area of the shaded part of N.
Answers
The area of the shaded part is:
[tex]=(PN)^2\lbrack\pi-\frac{1}{2}(75-\sin 75)\rbrack[/tex]Explanation:The area of the shaded part is the subtraction of the area of the unshaded part from the area of the whole circle.
Area of the ushaded part is:
[tex]\frac{1}{2}\times(PN)^2\times(75-\sin 75)[/tex]Area of the circle is:
[tex](PN)^2\pi[/tex]Area of the shaded part is:
[tex]\begin{gathered} (PN)^2\pi-\frac{1}{2}(PN)^2(75-\sin 75) \\ \\ =(PN)^2\lbrack\pi-\frac{1}{2}(75-\sin 75)\rbrack \end{gathered}[/tex]Two seamstresses sew 5 curtains in 3 hours. How many curtains will 12 seamstresses sew in the same time if the seamstresses all work at the same rate?
Answers
Answer:
30 curtains
Step-by-step explanation:
You have 6 times as many seamstresses so you will get 6 times as many curtains
6 * 5 = 30 curtains
−1= 8x+2i need help with this problem,
Answers
Given
-1 = 8x + 2
Answer
-1 = 8x + 2
-1 -2 =8x
-3 = 8x
x = -3/8
Translate and solve: The difference of a and 7 is 11
Answers
Answer:
(B)a=18
Explanation:
The difference of a and 7 translated as an expression is:
[tex]a-7[/tex]Thus, the equation is:
[tex]a-7=11[/tex]To solve for a, add 7 to both sides of the equation:
[tex]\begin{gathered} a-7+7=11+7 \\ a=18 \end{gathered}[/tex]The correct choice is B.
find the slop of the line passing through the points (1,-1) and (-1,1)
Answers
Answer:
I think its done this way. But I don't know if the answer is correct.
open up or down, vertex:(0,-4), passes through: (-3,5)
Answers
open up or down, vertex:(0,-4), passes through: (-3,5)
In this problem we have a vertical parabola open upward
the equation in vertex form is equal to
y=a(x-h)^2+k
where (h,k) is the vertex
we have
(h,k)=(0,-4)
substitute
y=a(x)^2-4
Find the value of a
with the point (-3,5)
substitute in the equation
5=a(-3)^2-4
5=9a-4
9a=5+4
9a=9
a=1
therefore
the equation is
y=x^2-4
answer is
f(x)=x^2-4select all reasons that support one or more statements in ghe proof.
Answers
Answer:
B, C, D and E.
Explanation:
The proof and reasons for each step is given below:
Step 1:
Statement: RSTU is a parallelogram.
Reason: Given
Step 2:
Statement: RS is parallel to TU and RU is parallel to TS
Reason: (B)Definition of a parallelogram
Step 3:
Statement: ∠RSU≅∠TUS and ∠RUS≅∠TSU.
Reason: (C)Alternate Interior angles are congruent
Step 4:
Statement: SU≅US.
Reason: (E)corresponding parts of congruent triangles are congruent.
Step 5:
Statement: Triangle RSU≅Triangle TUS.
Reason: AAS Congruence Theorem
Step 6:
Statement: RS≅TU and RU≅TS
Reason: (D)Opposite sides of a parallelogram are congruent.
The reasons that support the proof are B, C, D and E.
Please help quick :/
Answers
Answer:
The design fee is $40.
Step-by-step explanation:
The y intercept means the cost when the number of shirts ordered is 0. This means that in the context of this problem the y intercept is the design fee.
The amount of freight transported by rail in the u.s was about 580 billion ton-miles in 1960 and has been increasing at a rate of 2.32% per year since then.a. write a function representing the amount of freight, in billions of ton-miles, transported annually. ( 1960 = year 0 )b. graph the functionc. in what year would you predict that the number of ton-miles would have exceeded or would exceed 1 trillion (1,000 billion)?
Answers
The amount of freight transported by rail was 580 billion ton-miles in 1960.
The amount increased at a rate of 2.32% per year.
a. The growth in freight transport with respect to the passing years can be expressed as exponential growth. The general form of this equation is
[tex]y=a(1+r)^x[/tex]Where
y represents the final number after "x" periods of time
a represents the initial number at x=0
r represents the growth rate, expressed as a decimal value
x represents the number of time intervals that have passed
For this example, the initial amount is a=580 billion
The growth rate is r=2.32/100=0.0232
You can determine the equation as follows:
[tex]y=580(1+0.0232)^x[/tex]b. This function is of exponential increase, its domain is all real numbers and its range is all positive real numbers, you can symbolize it as y > 0, it's increasing, and it has a horizontal asymptote as x approaches -∞
To graph it, you have to determine at least two points of the graph, I will determine 3
For x=-100
[tex]\begin{gathered} y=580(1+0.0232)^{-100} \\ y=58.53 \end{gathered}[/tex]For x=0
[tex]\begin{gathered} y=580(1+0.0232)^0 \\ y=580 \end{gathered}[/tex]For x=10
[tex]\begin{gathered} y=580(1+0.0232)^{10} \\ y=729.51 \end{gathered}[/tex]The points are
(-100,58.53)
(0,580)
(10,729.51)
Plot the points and then draw an increasing line from -∞ to +∞
c. To determine the time when the freight transported will exceed 1000 billion tom-miles, you can use the graph, just determine the value of x, for which y=1000
This value is approximate x=23.57
This means that counting from 1960 will take 23 and a half years to reach over a trillion ton-miles transported.
Add the number of years to the initial year to determine the date:
[tex]1960+23=1983[/tex]By 1983 the number of ton-miles transported will exceed the trillion.
two functions are given below: f(x) and h(x) state the axis of symmetry for each function and explain how to find it f(x)=3(x+4)^2+1
Answers
The axis of symmetry for each function are x = -4 and x =1
How to determine the axis of symmetry for each function?The functions are given as
f(x) and h(x)
As a general rule of functions;
The axis of symmetry for a function is the x-coordinate of the vertex of the function
In f(x), we have
f(x)=3(x+4)² + 1
The vertex of this function is
(x, y) = (-4, 1)
So, the axis is x = -4
For function h(x), we have
The vertex of this function is
(x, y) = (1, -3)
So, the axis is x = 1
Hence, the axis of symmetry are x = -4 and x =1
Read more about axis of symmetry at
https://brainly.com/question/15709421
#SPJ1
The vertices of a rectangle are located at A(4, -1), B(-4, -1), C(-4, 6), and D(4, 6). What is the distance between the side AB and BC respectively?
Answers
The coordinates of the vertices of a rectangle are:
[tex]\begin{gathered} A\left(4,-1\right) \\ B\left(-4,-1\right) \\ C\left(-4,6\right) \\ D\left(4,6\right) \end{gathered}[/tex]Plotting these points:
The ages of three siblings, Ben, Bob and Billy, are consecutive integers. The square of the age of the youngest child Ben is four more than eight times the age of the oldest child, Billy. How old are the three boys?
Answers
Let the age of the youngest child (Ben) be x years.
Since the ages are consecutive integers, the ages of the other 2 are (x + 1) and (x + 2).
It was given that the age of the youngest child is four more than eight times the age of the oldest child. This means that:
[tex]x^2-4=8(x+2)[/tex]We can rearrange the equation above and solve for x as a quadratic equation:
[tex]\begin{gathered} x^2-4=8x+16 \\ x^2-8x-20=0 \end{gathered}[/tex]Using the factorization method, we have:
[tex]\begin{gathered} x^2-10x+2x-20=0 \\ x(x-10)+2(x-10)=0 \\ (x-10)(x+2)=0 \\ \therefore \\ x-10=0,x+2=0 \\ x=10,x=-2 \end{gathered}[/tex]Since the age cannot be negative, the age of the youngest child is 10.
Therefore, the ages are:
[tex]\begin{gathered} Ben=10\text{ }years \\ Bob=11\text{ }years \\ Billy=12\text{ }years \end{gathered}[/tex]Dianne is 23 years older than her daughter Amy. In 5 years, the sum of their ages will be 91. How old are they now?Amy is ? years old, and Dianne is ? years old.
Answers
Currently
Let Amy's current age be x. Since Dianne is 23 years older than her daughter, then she is (x + 23) years old.
In 5 years
Amy's age will be (x + 5) years.
Dianne's age will be:
[tex]x+23+5=(x+28)\text{ years}[/tex]The sum of their ages in 5 years is 91. Therefore, we have:
[tex](x+5)+(x+28)=91[/tex]Solving, we have:
[tex]\begin{gathered} x+5+x+28=91 \\ 2x=91-5-28 \\ 2x=58 \\ x=\frac{58}{2} \\ x=29 \end{gathered}[/tex]Amy is 29 years old. Therefore, Dianne will be:
[tex]29+23=52\text{ years old}[/tex]ANSWER:
Amy is 29 years old, and Dianne is 52 years old.
P(B) = 2/3P(An B) = 1/6What will P(A) have to be for A and B to be independent?1/211/121/45/6
Answers
P(B) = 2/3
P(An B) = 1/6
What will P(A) have to be for A and B to be independent?
Remember that
Events A and B are independent if the equation P(A∩B) = P(A) · P(B) holds true
substitute given values
1/6=P(A)*(2/3)
solve for P(A)
P(A)=1/4How much money would you have if you deposited $100.00 in an account thatearned 8% interest after 20 years?
Answers
Problem:
How much money would you have if you deposited $100.00 in an account that earned 8% interest after 20 years?.
Solution:
Step 1: Calculate 8% of the given amount ($100.00):
[tex]100.00\text{ x 0.08 = \$8 }[/tex]Step 2: Add the above value to the money deposited:
$100.0 + $8 = $108.0
Thus, we can conclude that the money in this account after 20 years is $108.0
find the perimeter of a garden that measures 6 feet by 3/4 foot?
Answers
The perimeter of a garden that measures 6 feet by 3/4 foot is 13.50 feet.
What is the perimeter?The perimeter of a rectangle is calculated thus:
Perimeter = 2(Length + Width)
From the information, we want to find the perimeter of a garden that measures 6 feet by 3/4 foot.
This will be illustrated thus:
Perimeter = 2(Length + Width)
Perimeter = 2(6 + 3/4)
Perimeter = 2(6 + 0.75)
Perimeter = 2(6.75)
Perimeter = 13.50
Learn more about perimeter on:
brainly.com/question/19819849
#SPJ1
I don’t know what im doing wrong. Can someone help?
Answers
We want to write
[tex]\frac{\sqrt[]{5}+1}{2}[/tex]as decimal, doing it on a calculator we have
[tex]\frac{\sqrt[]{5}+1}{2}=1.61803398875[/tex]But we only need three decimal places, then the result is
[tex]\frac{\sqrt[]{5}+1}{2}=1.618[/tex]
How do I solve this and what is the answer
Answers
Answer:
Answer is 20 degrees
:)
The band is selling T-shirts for $15.00 each. They make $5.00 profit from each shirt sold. Write an equation to represent the profit earned,y,for selling,x,number of shirts.
Answers
The equation to represent the profit earned y, for selling x, number of shirts is y = 5x.
Given that:-
Selling Price of T-shirt = $ 15
Profit earned per T-shirt = $ 5
We have to form an equation to represent the profit earned y, for selling x, number of shirts.
We know that,
Profit earned by selling 1 T-shirt = $ 5
Hence, profit earned by selling x T-shirts = 5*x
We know that,
Profit earned by selling x T-shirts = y
Hence, we can write,
y = 5x
Hence, the equation that represents the profit earned y, for selling x, number of shirts is y = 5x.
To learn more about equation, here:-
https://brainly.com/question/10413253
#SPJ1
the length of the rectangle is two feet less than 3 times the width.if the area is 65ft^2.find the dimension.
Answers
Given:
The area of the rectangle, A=65ft^2.
Let l be the length of the rectangle and w be the width of the rectangle.
It is given that the length of the rectangle is two feet less than 3 times the width.
Hence, the expression for the length of the rectangle is,
[tex]l=3w-2\text{ ----(A)}[/tex]Now, the expression for the area of the rectangle can be written as,
[tex]\begin{gathered} A=\text{length}\times width \\ A=l\times w \\ A=(3w-2)\times w \\ A=3w^2-2w \end{gathered}[/tex]Since A=65ft^2, we get
[tex]\begin{gathered} 65=3w^2-2w \\ 3w^2-2w-65=0\text{ ---(1)} \end{gathered}[/tex]Equation (1) is similar to a quadratic equation given by,
[tex]aw^2+bw+c=0\text{ ---(2)}[/tex]Comparing equations (1) and (2), we get a=3, b=-2 and c=-65.
Using discriminant method, the solution of equation (1) is,
[tex]\begin{gathered} w=\frac{-b\pm\sqrt[]{^{}b^2-4ac}}{2a} \\ w=\frac{-(-2)\pm\sqrt[]{(-2)^2-4\times3\times(-65)}}{2\times3} \\ w=\frac{2\pm\sqrt[]{4^{}+780}}{2\times3} \\ w=\frac{2\pm\sqrt[]{784}}{6} \\ w=\frac{2\pm28}{6} \end{gathered}[/tex]Since w cannot be negative, we consider only the positive value for w. Hence,
[tex]\begin{gathered} w=\frac{2+28}{6} \\ w=\frac{30}{6} \\ w=5\text{ ft} \end{gathered}[/tex]Now, put w=5 in equation (A) to obtain the value of l.
[tex]\begin{gathered} l=3w-2 \\ =3\times5-2 \\ =15-2 \\ =13ft \end{gathered}[/tex]Therefore, the length of the rectangle is l=13 ft and the width is w=5 ft.
Consider the equation cos(2t) = 0.8. Find the smallest positive solution in radians and round your answer to 2 decimal places.
Answers
Given:
cos(2t) = 0.8
Take the cos⁻' of both-side of the equation.
cos⁻' cos(2t) = cos⁻'(0.8)
2t = cos⁻'(0.8)
Calculate the value of the right- hand side with your calculator in radians.
2t =0.6435
Divide both-side of the equation by 2
t ≈ 0.32
A granite pyramid is 50 feet high and has a square base 30 feet on a side. If granite weighs 180 pounds per cubic foot, what is the weigh in tons of the pyramid?
Answers
The weight of the granite pyramid in tons is 1350 tons.
How to find the weight of the pyramid granite in tons?A pyramid is a three-dimensional shape.
The granite pyramid is 50 feet high and has a square base of 30 feet on a side.
Granit weighs 180 pounds per cubic foot.
Therefore, the weight in tons of the pyramid can be calculated as follows;
Hence,
volume of the granite pyramid = 1 / 3 b² h
Therefore,
volume of the granite pyramid = 1 / 3 × 30² × 50
volume of the granite pyramid = 45000 / 3
volume of the granite pyramid = 15000 ft³
Hence,
1 ft³ = 180 pounds
15000 ft³ = ?
weight = 2700000 pounds
1 pounds = 0.0005 tons
2700000 pounds = ?
Therefore,
weight of the pyramid granite in tons = 1350 tons
learn more on pyramid here:https://brainly.com/question/16813731
#SPJ1
how to find the width to a pyramid with the volume height and length
Answers
The volume of a pyramid is given by the formula
[tex]V_{\text{pyramid}}=\frac{1}{3}\times base\text{ area}\times height[/tex]Write out the given dimensions
[tex]\begin{gathered} \text{Volume}=80\operatorname{cm}^3 \\ \text{Height}=10\operatorname{cm} \\ \text{length}=6\operatorname{cm} \\ \text{width}=\text{unknown} \end{gathered}[/tex]Since the base of the pyramid is a rectangle, the base area is
[tex]A_{\text{rectangle}}=\text{width }\times length[/tex]Substituting the given dimensions to get the value of the width\
[tex]\begin{gathered} V_{\text{pyramid}}=\frac{1}{3}\times width\times length\times height \\ 80=\frac{1}{3}\times width\times6\operatorname{cm}\times10\operatorname{cm} \end{gathered}[/tex][tex]\begin{gathered} 80\operatorname{cm}=20\times width \\ \text{width}=\frac{80}{20} \\ \text{width}=4\operatorname{cm} \end{gathered}[/tex]Hence, the width of the pyramid is 4cm