Given the equation, make r the subject of the formula.

To determine if a basis for R2, we need to check if the two vectors in the basis are linearly independent. Let's call these vectors v1 and v2. If we can find scalars c1 and c2 such that c1v1 + c2v2 = 0 (where 0 is the zero vector), then the two vectors are linearly dependent and not a basis for R2.

However, if the only solution to this equation is c1 = c2 = 0, then the vectors are linearly independent and form a basis for R2.

Let's say the basis for R2 is B = {v1, v2}. To find the coordinates of the vector x relative to this basis, we need to find scalars a1 and a2 such that x = a1v1 + a2v2.

In other words, we need to solve the system of equations:

6 = a1(1) + a2(-1)
-17 = a1(2) + a2(3)

Solving for a1 and a2, we get:

a1 = -5
a2 = -4

Therefore, the coordinates of the vector x relative to the basis B are (-5, -4).
To find the coordinates of the vector x⃗ = [6, -17] relative to the basis B, follow these steps:

Step 1: Identify the basis B.
First, you need to provide the basis B for R2. A basis for R2 consists of two linearly independent vectors, usually denoted as b1 and b2 (e.g., B = {b1, b2}).

Step 2: Set up the equation to express x⃗ in terms of the basis B.
Write x⃗ as a linear combination of the basis vectors b1 and b2:
x⃗ = c1 * b1 + c2 * b2

Step 3: Solve the system of equations for coefficients c1 and c2.
Create a system of linear equations to solve for c1 and c2 using the components of x⃗, b1, and b2.

Step 4: Obtain the coordinates relative to the basis B.
Once you have found the coefficients c1 and c2, the coordinates of x⃗ relative to the basis B will be (c1, c2).

Please provide the basis B to proceed with the calculation.

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The words or phrase that correctly describes the variables of the linear regression include the following:

Slope, a = 1.464285714.

y-intercept, b = 45.71428571

Coefficient of determination, r² = 0.942264574

Correlation coefficient, r = 0.9707031338.

In Mathematics, a coefficient of determination (r² or r-squared) can be defined as a number between zero (0) and one (1) that is typically used for measuring the extent (how well) to which a statistical model predicts an outcome.

Based on the given data, the correlation can be determined by using an online graphing calculator as shown in the image attached above. Since the value of correlation coefficient (r) is equal to 0.9707031338, the coefficient of determination (r²) can be calculated by squaring the value of correlation coefficient (r) as follows;

r = 0.9707031338

r² = 0.9707031338²

r² = 0.942264574

For the correlation coefficient, we have the following:

r = √0.942264574

r = 0.9707031338

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Answer: 173

Step-by-step explanation:

8+12= 20

152+1= 153

153+20= 173

Check the picture below.

Answer:

Step-by-step explanation:

The total number of seventh-grade students who play an instrument is 9 + 9 + 11 + 9 = 38. The number of seventh-grade students who play an instrument other than guitar is 9 + 11 + 9 = 29. Therefore, the probability that a seventh grader chosen at random will play an instrument other than guitar is 29/38 ≈ 0.76 (rounded to the nearest hundredth).

The solutions of the inequality t + 7 ≤ 12 are 4 and 5.

We were given the options 4, 5, 6which was given so as to determine the solutions from them that fit in for ththe given  inequality t + 7 ≤ 12.

Then we can test the options one after the other, from the first option we can test if 4 is a solution as ;

4 + 7 ≤ 12,

11 ≤ 12. ( This can be considered as a solution because 11 is less than 12.

From the second option we can test if 5  is a solution as ;

5 + 7 ≤ 12

12 ≤ 12.  ( This can be considered as a solution because 12 is equal 12.

from the last option;  

6 + 7 ≤ 12

13 ≤ 12.

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The length of the curve y=2−x²,0≤x≤1 is approximately 1.70 units.

To use the arc length formula to compute the length of the curve y=√2−x²,0≤x≤1y=2−x²,0≤x≤1, we first need to find the derivative of each equation.

For y=√2−x², the derivative is y'=-x/√2-x².

For y=2-x², the derivative is y'=-2x.

Next, we can use the arc length formula:

L = ∫aᵇ √[1+(y')²] dx

For y=√2−x²,0≤x≤1:

L = ∫0¹ √[1+(-x/√2-x²)²] dx
L = ∫0¹ √[(2-x²)/(2-x²)] dx
L = ∫0¹ dx
L = 1

Therefore, the length of the curve y=√2−x2,0≤x≤1 is 1 unit.

For y=2−x2,0≤x≤1:

L = ∫0¹ √[1+(-2x)²] dx
L = ∫0¹ √[1+4x²] dx
L = 1/2 × (1/2 × ln(2√(5)+5) + 1/2 × √(5) + 1/2 × ln(2√(5)+1) + 1/2)
L ≈ 1.70

Therefore, the length of the curve y=2−x²,0≤x≤1 is approximately 1.70 units.

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Sample A has a range of 10 (18-8) while Sample B has a range of 10 as well (26-16). Therefore, both samples have the same range and thus the same standard deviation. Therefore, the answer is: Both samples have the same standard deviation.

To determine which sample has the largest standard deviation, we need to calculate the standard deviation for both Sample A and Sample B.

To determine which sample has the largest standard deviation, we can calculate the standard deviation for both samples using a formula or a calculator. However, in this case, we can simply look at the range of the scores in each sample. The larger the range, the larger the standard deviation.

Step 1: Calculate the mean of each sample.
Sample A: (8+10+12+15+18)/5 = 63/5 = 12.6
Sample B: (16+18+20+23+26)/5 = 103/5 = 20.6

Step 2: Calculate the variance of each sample.
Sample A: [(8-12.6)^2+(10-12.6)^2+(12-12.6)^2+(15-12.6)^2+(18-12.6)^2]/4 = [21.16+6.76+0.36+5.76+29.16]/4 = 62.96/4 = 15.74
Sample B: [(16-20.6)^2+(18-20.6)^2+(20-20.6)^2+(23-20.6)^2+(26-20.6)^2]/4 = [21.16+6.76+0.36+5.76+29.16]/4 = 62.96/4 = 15.74

Step 3: Calculate the standard deviation for each sample (square root of variance).
Sample A: sqrt(15.74) ≈ 3.97
Sample B: sqrt(15.74) ≈ 3.97

Both samples have the same standard deviation of approximately 3.97.

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1. Find your greatest common factor (GCF). 2x - 3y is your greatest common factor.
2. Factor out your GCF. (2x - 3y)((2x - 3y)²/2x - 3y) + -(3x + 4y)(2x - 3y)/2x - 3y) Don't fret about the size! This is the fastest way to simplify.
3. Simplify each term. (2x - 3y)(2x - 3y - 3x - 4y)
4. Combine like terms. (2x - 3y)((2x - 3x) + (-3y - 4y))
5. Simplify (2x - 3x) + (-3y - 4y). -x - 7y.
6. Simplify final equation. (2x - 3y)(-x - 7y)

Okay, here are the steps to solve this problem:

* 16 students play football

* 12 students play table tennis

* 5 students play both football and table tennis

* So students who play football = 16

* Students who play table tennis = 12

* Students who play both = 5

* To find students who play at least one game:

16 + 12 - 5 = 23

* Total students = 31

* So students who play no game = 31 - 23 = 8

Therefore,

Number of students who play at least one game = 23

Number of students who play none of the games = 8

Does this make sense? Let me know if you have any other questions!

Answer:

35

Step-by-step explanation:

9*5=45

7*5=35

Answer:

35/45 is the correct answer

Answer:

titi got 28 walnuts

Step-by-step explanation:

If we have the ratio of walnuts for each person and at least one value, we can solve for the other values.

tayo : titi : tunde

 3x  : 4x :  5x      (x is just a variable for the exact quantity of walnuts relative to the ratio)

If tayo has 21 walnuts, this means that

3x = 21

We can solve this equation for x

3x=21

21/3=7

x=7

Now that we know x, we can plug it in for the other values to solve for the amount of walnuts that titi and tunde have.

If titi has 4x walnuts, and x=7, then we can solve for the amount of walnuts titi has.

4*7=28

Therefore, titi has 28 walnuts

The given boundaries are the x-axis (y = 0), the line y = 1, and the curve y = √x (not √4 as mentioned, since √4 is a constant value). So, the area of the shaded region is 2/3 square units.

To find the area of the shaded region, we need to integrate the given functions with respect to x.

The given boundaries are the x-axis (y = 0), the line y = 1, and the curve y = √x (not √4 as mentioned, since √4 is a constant value).

First, we need to find the intersection points of the curve y = √x and the line y = 1. To do this, set the two equations equal to each other:

√x = 1

Square both sides to solve for x:

x = 1

Now, we can find the area of the shaded region by integrating the difference between the curve and the x-axis:

Area = ∫[1 - 0] (√x - 0) dx

To integrate, apply the power rule:

∫x^(1/2) dx = (2/3)x^(3/2)

Evaluate the integral from 0 to 1:

Area = [(2/3)(1)^(3/2) - (2/3)(0)^(3/2)] - [0]

Area = (2/3) - 0

Area = 2/3

So, the area of the shaded region is 2/3 square units.

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Answer:

x = 100°

x = 100°y = 85°

Step-by-step explanation:

X + 80° = 180°

x = 180° - 80°

x = 100°

y + 95° = 180°

y = 180° - 95°

y = 85°

The estimate of the series is -2.

Using the formula for the sum of an infinite geometric series, we have:
[infinity]Σ (2n + 1)-5 n=1 = [(2(1)+1)-5]/(1-2) = -2

To find the error in our estimate, we can use the formula for the remainder of an infinite series:
R = |a(n+1)|/(1-r), where a = (2n+1)-5 and r = 2

Since we want the estimate to be correct to five decimal places, we need to find the smallest value of n such that |a(n+1)|/(1-r) < 0.00001:

|a(n+1)|/(1-r) = |(2(n+1)+1)-5|/2(n+1) < 0.00001
|(2n+3)-5| < 0.00001(2n+1)
|-2| < 0.00002n + 0.00001
n > 99999.5

Therefore, we need to calculate the sum up to at least the 100,000th term to be sure our estimate is correct to five decimal places. However, since the sum is -2, which is a finite number, we know that our estimate is already correct to five decimal places.

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A random variable x has a mean of 10 and a variance of 4.  the answer is approximately 0.0228.

To solve this problem, we need to find the probability of the random variable x being less than 6.

Let Z be the standardized normal random variable, which is defined as:

Z = (X - μ) / σ

where X is the random variable, μ is the mean, and σ is the standard deviation.

We can use the standardized normal distribution to find the probability of Z being less than a certain value.

In this case, we have:

Z = (6 - 10) / 2 = -2

The probability of Z being less than -2 can be found using a standard normal distribution table or calculator. From the table, we find that:

P(Z < -2) = 0.0228

Therefore, the probability of x being less than 6 is:

P(X < 6) = P(Z < -2) = 0.0228

So the answer is approximately 0.0228.

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The area of the parallelogram whose vertices are listed (0,0), (2,8), (7,4), (9,12). The area of the parallelogram is 20 square units.

To find the area of a parallelogram, we need to know the base and height of the parallelogram. One of the sides of the parallelogram will serve as the base, and the height will be the distance between the base and the opposite side.

We can start by drawing the parallelogram using the given vertices:

(0,0)         (7,4)
     *---------*
     |         |
     |         |
     |         |
     *---------*
(2,8)         (9,12)

We can see that the sides connecting (0,0) to (2,8) and (7,4) to (9,12) are parallel, so they are opposite sides of the parallelogram. We can use the distance formula to find the length of one of these sides:

d = √[(9 - 7)^2 + (12 - 4)^2]
 = √[(2)^2 + (8)^2]
 = √68

So the length of one side is √68.

Next, we need to find the height of the parallelogram. We can do this by finding the distance between the line connecting (0,0) and (2,8) and the point (7,4). We can use the formula for the distance between a point and a line to do this:

h = |(7 - 0)(8 - 4) - (2 - 0)(4 - 0)| / √[(2 - 0)^2 + (8 - 0)^2]
 = |28 - 8| / √68
 = 20 / √68

Now we have the base (√68) and the height (20 / √68) of the parallelogram, so we can find the area using the formula:

A = base x height
 = (√68) x (20 / √68)
 = 20

Therefore, the area of the parallelogram is 20 square units.

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The value that is a solution to f(x) = g(x) is x = 4.

What is a function?

Each element of X receives exactly one element of Y when a function from one set to the other is used. The sets X and Y are collectively referred to as the function's domain and codomain, respectively. Initially, functions represented the idealized relationship between two changing quantities.

Here, we have

Given: f(x) = −x² + 4x + 12

g(x) = x + 8,  x = 1 x = 2 x = 3 x = 4 x = 5 x = 6

We have to find the value that is a solution to f(x) = g(x).

When x = 1

f(1) = −(1)² + 4(1) + 12

f(1) = -1 + 4 + 12

f(1) = 15

g(1) =  1 + 8

g(1) = 9

f(1) ≠ g(1)

When x = 2

f(2) = −(2)² + 4(2) + 12

f(2) = -4 + 8 + 12

f(2) = 16

g(2) = 2 + 8

g(2) = 10

f(2) ≠ g(2)

When x =3

f(3) = −(3)² + 4(3) + 12

f(3) = -9 + 12 + 12

f(3) = 15

g(3) = 3 + 8

g(3) = 11

f(3) ≠ g(3)

When x = 4

f(4) = −(4)² + 4(4) + 12

f(4) = -16 + 16 + 12

f(4) = 12

g(4) = 4 + 8

g(4) = 12

f(4) = g(4)

When x = 5

f(5) = −(5)² + 4(5) + 12

f(5) = -25 + 20 + 12

f(5) = -5 + 12

f(5) = 7

g(5) = 5 + 8

g(5) = 13

f(5) ≠ g(5)

When x = 6

f(6) = −(6)² + 4(6) + 12

f(6) = -36 + 24 + 12

f(6) = 0

g(6) = 6 + 8

g(6) = 14

f(6) ≠ g(6)

Hence, the value that is a solution to f(x) = g(x) is x = 4.

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Since ab = ba and a commutes with any element b in G, therefore, a is the only element of order 2 in a group, then a lies in the center of the group.

Let G be a group with an element a of order 2, and assume that a is the only element of order 2 in G. We want to show that a lies in the center of the group, which means that for any element b in G, ab = ba.

Proof:

1. Let b be an arbitrary element in G.
2. Consider the element bab⁻¹. We will first show that (bab⁻¹)² = e, where e is the identity element in G.
3. (bab⁻¹)² = (bab⁻¹)(bab⁻¹) = ba(b⁻¹b)ab⁻¹ = ba(ab⁻¹) = ba²b⁻¹ = beb⁻¹ = bb⁻¹ = e
4. Since (bab⁻¹)² = e, bab⁻¹ has order 2.
5. Since a is the only element of order 2 in G, we have that bab⁻¹ = a.
6. Now we will multiply both sides of the equation bab⁻¹ = a by b on the right.
7. bab⁻¹b = ab
8. Finally, we can multiply both sides of the equation by b⁻¹ on the right to obtain the desired result: ab = ba.

So, a lies in the center of the group, as it commutes with any element b in G.

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The coordinate vector [x]b is: [x]b = [c1, c2]^T = [3, 2/5]^T relative to the given basis B. 31 - - 11 - 3 and B = {b1, b2} 0 [3] O P 이 5

To find the coordinate vector [x]b of the vector x relative to the basis B = {b1, b2}, we need to express x as a linear combination of b1 and b2, and then write down the coefficients as the coordinate vector.
Let's first find the coefficients by solving the system of equations:
x = c1*b1 + c2*b2
where x = [3, -1]^T, b1 = [1, -1]^T, and b2 = [0, 5]^T.
Substituting the values, we get:
[3, -1]^T = c1*[1, -1]^T + c2*[0, 5]^T
which gives us the following two equations:
3 = c1

-1 = -c1 + 5c2
Solving for c1 and c2, we get:
c1 = 3
c2 = 2/5
Therefore, the coordinate vector [x]b is:
[x]b = [c1, c2]^T = [3, 2/5]^T
To find the coordinate vector [x]_B of the vector x relative to the given basis B, you need to express x as a linear combination of the basis vectors b1 and b2. Based on the information provided, we have:
x = (31, -11, -3)
B = {b1, b2}
However, it seems that the values of b1 and b2 are missing or not clearly provided. If you could provide the correct values for b1 and b2.

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the actual answer is 24.2.m

Step-by-step explanation: won't let you put it in

Using Law of Sines to solve a triangle with B=A=94.7°, C=13.2°, and a=22.1 gives b≈2.25 and angles A = B ≈ 94.7 and C≈13.2. The equation cos(2x) + cos(x) = 0 has solutions x=π/3, 2π/3, 4π/3, and 5π/3 on the interval [0, 2π). If it has magnitude 5 and makes a 60° angle with the positive x-axis, then its component form is (2.5, 4.33) and its magnitude is ∥v∥ ≈ 5.06.

First, we can use the Law of Sines to find the length of side b

sin(B)/b = sin(A)/a

sin(94.7)/b = sin(94.7)/22.1

b = 22.1 * sin(13.2) / sin(94.7)

b ≈ 2.25

Next, we can use the fact that the angles of a triangle sum to 180 degrees to find the measure of angle B

B + A + C = 180

94.7 + 94.7 + 13.2 = 202.6

B ≈ 72.1

Finally, we can use the fact that the angles of a triangle sum to 180 degrees again to find the measure of angle C

B + A + C = 180

72.1 + 94.7 + C = 180

C ≈ 13.2

Therefore, the triangle has sides a = 22.1, b ≈ 2.25, and c ≈ 22.11, and angles A = B ≈ 94.7 and C ≈ 13.2.

To solve the equation cos(2x) + cos(x) = 0 on the interval [0, 2π), we can use the identity cos(2x) = 2cos^2(x) - 1 to get

2cos^2(x) - 1 + cos(x) = 0

Simplifying

2cos^2(x) + cos(x) - 1 = 0

We can now use the quadratic formula to solve for cos(x)

cos(x) = (-b ± sqrt(b^2 - 4ac)) / 2a

where a = 2, b = 1, and c = -1. Substituting in

cos(x) = (-1 ± sqrt(1 + 8)) / 4

cos(x) = (-1 ± sqrt(9)) / 4

cos(x) = -1/2 or cos(x) = 1/2

Taking the inverse cosine of each solution

x = 2π/3 or x = 4π/3 or x = π/3 or x = 5π/3

Therefore, the solutions in the interval [0, 2π) are x = π/3, x = 2π/3, x = 4π/3, and x = 5π/3.

To find the component form and magnitude of a vector v, we need to know its magnitude and direction. If we have the magnitude and the angle that the vector makes with the positive x-axis, we can use trigonometry to find its component form.

Let's say that the magnitude of v is 5 and the angle that it makes with the positive x-axis is 60 degrees. Then the x-component of v is given by

v_x = ∥v∥ * cos(60)

v_x = 5 * cos(60)

v_x ≈ 2.5

And the y-component of v is given by

v_y = ∥v∥ * sin(60)

v_y = 5 * sin(60)

v_y ≈ 4.33

Therefore, the component form of v is (2.5, 4.33) and its magnitude is

∥v∥ = sqrt(v_x^2 + v_y^2) = sqrt(2.5^2 + 4.33^2) ≈ 5.06

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In a sample of 20 items, where six are defective. In this case, you should use  a. the plus four methods to construct the confidence interval.

The plus four methods, also known as the adjusted-Wald method,  are used when dealing with proportions, especially when the sample size is small or the proportion is close to 0 or 1. Since your sample size is only 20 items, the plus four methods is the most appropriate choice. This method involves adding four "virtual" observations to the sample data: two successes and two failures. This helps to adjust the estimates and produce a more accurate confidence interval.

In conclusion, for constructing a confidence interval for the proportion of defectives in a small sample like the one you provided, it's recommended to use the plus four methods (option a) as it adjusts for the small sample size and provides a more accurate estimate than the large-sample interval. Therefore the correct option is A.

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Δy ≈ 0.449 and dy ≈ 0.480. Both values are close, but dy is slightly larger than Δy. This difference is due to the linear approximation of the change in y as opposed to the actual change in y when using the given function.

To find and compare Δy and dy, we will use the given function y = 0.8x6 and the values x = 1 and Δx = dx = 0.1.

First, find the value of y when x = 1:
y = 0.8(1)6 = 0.8

Next, find the value of y when x = 1 + Δx (i.e., x = 1.1):
y_new = 0.8(1.1)6 ≈ 1.2491

Now, we can calculate Δy as the difference between y_new and y:
Δy = y_new - y ≈ 1.2491 - 0.8 = 0.449

To find dy, we will use the derivative of the function y = 0.8x6:
dy/dx = 0.8 * 6 * x^5 = 4.8x5

Then, evaluate the derivative at x = 1:
dy/dx = 4.8(1)5 = 4.8

Finally, find dy by multiplying the derivative by Δx:
dy = (dy/dx) * Δx = 4.8 * 0.1 = 0.48

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Answer :-The series will only converge

To show that rln(n) = nln(r), we can take the natural logarithm of both sides:

ln(rln(n)) = ln(r) + ln(n)

Using the properties of logarithms, we can simplify this to:

ln(r) + ln(ln(n)) = ln(r) + ln(n)

Canceling out the ln(r) term, we are left with:

ln(ln(n)) = ln(n)

Taking the exponential of both sides, we get:

ln(n) = e^(ln(ln(n))) = ln(n)

This shows that rln(n) = nln(r).

To determine the values of r for which the series ∑n=1[infinity]rln(n) converges, we can use the integral test.

Integrating rln(x) with respect to x gives:

∫rln(x)dx = xrln(x) - x + C

Evaluating this from 1 to infinity, we get:

lim[x→∞] xrln(x) - x + C - (1ln(1) - 1 + C)

= lim[x→∞] xrln(x) - x + 1

Using L'Hopital's rule, we can evaluate the limit as:

lim[x→∞] rln(x) = ∞

Therefore, the series will only converge if rln(n) approaches zero as n approaches infinity. This means that r must be less than or equal to 1.

In summary, the values of r (with r>0) for which the series ∑n=1[infinity]rln(n) converges are r≤1.

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Step-by-step explanation:

A model can help you solve surface area and volume problems because shows faces and helps you find the volume or area.

These problems can be challenging for some students because it implies imaging or visualizing 3-d objects to understand the dimensions of the figure, the number of faces, and then to calculate the volume or surface area.

This can be solved by using a model such as a graph or drawing that will help you to get a better idea of the object that is being analyzed.

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a and b are both positive, therefore, the maximum value of f(x) on the interval 0 ≤ x ≤ 2 is: f(2/b) = (2/b)ᵃ * (2-2/b)ᵇ

To find the maximum value of f(x) on the interval 0 ≤ x ≤ 2, we can take the derivative of f(x) with respect to x and set it equal to zero to find the critical points.
f(x) = xa(2-x)b
f'(x) = a(2-x)b * (1-bx)
Setting f'(x) equal to zero, we get:
a(2-x)b * (1-bx) = 0
This equation has two solutions:

x = 0 and x = 2/b.
To determine which of these critical points corresponds to a maximum value of f(x), we can use the second derivative test.
f''(x) = 2abx(b-1)
At x = 0, f''(x) = 0,

so we cannot use the second derivative test to determine the nature of this critical point.
At x = 2/b, f''(x) = 2ab(2-b)/b.
Since a and b are both positive, we can see that f''(x) is positive when 0 < b < 2, and negative when b > 2. This means that x = 2/b corresponds to a maximum value of f(x) when 0 < b < 2.
Therefore, the maximum value of f(x) on the interval 0 ≤ x ≤ 2 is:
f(2/b) = (2/b)ᵃ * (2-2/b)ᵇ
To find the maximum value of the function f(x) = xa(2-x)b on the interval 0 ≤ x ≤ 2, we'll use calculus. First, let's find the derivative of the function:
f'(x) = (a * x^(a-1)) * (2-x)ᵇ + (xa^(a)) * (-b * (2-x)^(b-1))
Now, let's set f'(x) to zero and solve for x:
0 = (a * x^(a-1)) * (2-x)ᵇ + (xa^(a)) * (-b * (2-x)^(b-1))
This equation can be difficult to solve analytically, but we can determine critical points by looking at the behavior of the function on the given interval. Since a and b are positive, the function will always be positive and continuous on the interval.
At the interval boundaries, f(0) = 0 and f(2) = 0, since any positive number raised to the power of 0 is 1, and the product becomes zero when x = 0 or x = 2. Thus, the maximum value occurs at an interior point where f'(x) = 0.
Using numerical methods or computer software, you can find the value of x that makes the derivative zero. Once you have that x-value, plug it back into the original function f(x) to find the maximum value of the function on the interval 0 ≤ x ≤ 2.

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Answer:

b- number of books

t- total spent

b7+5=t

she ordered 8 books

Step-by-step explanation:

$61 minus the $5 shipping fee = $56

$56 divided by $7 (the cost of each book) is 8

7b+5=61

    -5   -5

7b = 56

-------------

7b

b= 8

so she bought 8 books