The 95% confidence interval states that 95% of the sample means of a specified sample size selected from a population will lie within plus and minus 1.96 standard deviations of the hypothesized population mean. True or False

According to the information, whether or not 3 liters of water is a reasonable amount for Lan to fill his watering can with depends on the size of the watering can and the number of plants he needs to water.

Whether it is reasonable for Lan to fill the watering can with 3 liters of water depends on the size of the watering can and the number of plants he needs to water.

Without any additional information, it is difficult to determine if 3 liters is a reasonable amount of water for Lan to fill the watering can with. However, we can make some general assumptions based on common watering can sizes.

A typical watering can usually holds between 1 to 5 liters of water, with the most common size being around 2-3 liters. If Lan's watering can is a standard size, then filling it with 3 liters of water would be reasonable.

On the other hand, if Lan needs to water a large number of plants or if his watering can is much smaller or larger than a standard size, then he may need to adjust the amount of water he fills it with accordingly.

In summary, whether or not 3 liters of water is a reasonable amount for Lan to fill his watering can with depends on the size of the watering can and the number of plants he needs to water. Without any additional information, it is difficult to say for certain.

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The solution is, area of this diagram is (2x^2 + 9x + 8) unit^2 and perimeter of this diagram is 6x + 18 unit.

We have,

Area of a rectangle (A) is the product of its length (l) and width (w). Basically, the formula for area is equal to the product of length and breadth of the rectangle. Whereas when we speak about the perimeter of a rectangle, it is equal to the sum of all its four sides. Hence, we can say, the region enclosed by the perimeter of the rectangle is its area.

and, we know that,

perimeter of rectangle = 2 ( l + w)

here, we have,

from the given diagram, we get,

length = 2 + x

width = 2x + 7

so, perimeter is:

2( 2 + x + 2x + 7 )

=2 ( 3x + 9 )

=6x + 18 unit

now, area = area of upper part + area of lower part

so, we have,

area of upper part = 2(x+4) unit^2

area of lower part = x( 2x+7)

                              =2x^2 + 7x unit^2

so, we get,

area = [2(x+4) +2x^2 + 7x ] unit^2

        = (2x^2 + 9x + 8) unit^2

Hence, area of this diagram is (2x^2 + 9x + 8) unit^2 and perimeter of this diagram is 6x + 18 unit.

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Answer: $596.25

Step-by-step explanation:

159 x 3.75 = 596.25

Answer: There are [tex]\boxed{2^{23}}[/tex] bits in 1 megabyte.

Step-by-step explanation:

So by the problem statement,

1 byte = 2^3 bits,

1 kilobyte = 2^10 bytes, and

1 megabyte = 2^10 kilobytes.

Therefore,

[tex]1 \text{ megabyte} = 2^{10} \text{ kilobytes}\\= 2^{10} \cdot (2^{10} \text{ bytes})\\= 2^{10} \cdot 2^{10} \cdot (2^3 \text{ bits})\\= 2^{23} \text{ bits}.[/tex]

So our answer is 1 megabyte = 2^23 bits.

The earthquake in China was 2511.89 times more intense than the one in northern Algeria. Logarithms are used to calculate the difference in intensity between earthquakes on the Richter scale.

To calculate the difference in intensity, use the formula:

Intensity Ratio = 10^((Magnitude2 - Magnitude1)/b)

where Magnitude1 and Magnitude2 are the magnitudes of the earthquakes, and b is a constant value of 1.5 for the Richter scale.

Step 1: Subtract the magnitudes:
7.9 - 4.81 = 3.09

Step 2: Divide by b:
3.09 / 1.5 = 2.06

Step 3: Raise 10 to the power of the result:
10^2.06 ≈ 2511.89

The earthquake in China was 2511.89 times more intense than the one in northern Algeria.

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The matrices that have inverses are given as follows:

A matrix is said to have an inverse if the determinant assumes a value different of zero.

For a 2 x 2 matrix, the determinant is given by the multiplication of the principal diagonal subtracted by the multiplication of the secondary diagonal.

Hence the determinant of each matrix is given as follows:

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For any positive integer n and real numbers a and b with 0 < b < a, it is true that  [tex]a^n - b^n[/tex] <= n * [tex]a^n[/tex] * (a-b).

First, we can write [tex]a^n - b^n[/tex] as (a-b) multiplied by the sum of[tex]a^{(n-1)}*b^{(0)}, a^{(n-2)}*b^{(1)},...,b^{(n-1)}[/tex]. Using the fact that b < a, we can conclude that each term in this sum is less than or equal to [tex]a^{(n-1)}[/tex], since at least one of the exponents in each term is less than n-1.

So we have:

[tex]a^n - b^n[/tex] <= (a-b) * ( [tex]a^{(n-1)}[/tex] + [tex]a^{(n-1)}[/tex] + ... + [tex]a^{(n-1)}[/tex])

[tex]a^n - b^n[/tex] <= (a-b) * n * [tex]a^{(n-1)}[/tex]

Finally, we can rearrange this inequality to get:

[tex]a^n - b^n[/tex] <= n * [tex]a^n[/tex] * (a-b)

Therefore, we have proven that [tex]a^n - b^n[/tex] <= n * [tex]a^n[/tex] * (a-b) for any positive integer n and real numbers a and b with 0 < b < a.

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To find the external demand satisfied by each production schedule, we need to use the technology matrix in Example 6.20 of the textbook (pages 271-272). The matrix is:

|           | Product 1 | Product 2 | Product 3 |
|-----------|-----------|-----------|-----------|
| Resource 1|      1    |      2    |      1    |
| Resource 2|      2    |      1    |      2    |
| Resource 3|      1    |      1    |      2    |

Let's first consider the production schedule for X = 32. We can represent this schedule as a vector:

| 32 |
|----|
| 16 |
|  8 |

This means that we are producing 32 units of Product 1, 16 units of Product 2, and 8 units of Product 3. To find the external demand satisfied by this production schedule, we need to multiply this vector by the transpose of the technology matrix:

| 1 2 1 |   | 32 |   | 80 |
| 2 1 2 | x | 16 | = | 64 |
| 1 1 2 |   |  8 |   | 56 |

The resulting vector tells us that the external demand satisfied by this production schedule is 80 units of Product 1, 64 units of Product 2, and 56 units of Product 3. Therefore, the answer for part (1) is:

D = 80 + 64 + 56 = 200

Now let's consider the production schedule for X = 136. We can represent this schedule as a vector:

| 68 |
|----|
| 52 |
| 34 |

This means that we are producing 68 units of Product 1, 52 units of Product 2, and 34 units of Product 3. To find the external demand satisfied by this production schedule, we need to multiply this vector by the transpose of the technology matrix:

| 1 2 1 |   | 68 |   | 170 |
| 2 1 2 | x | 52 | = | 156 |
| 1 1 2 |   | 34 |   | 136 |

The resulting vector tells us that the external demand satisfied by this production schedule is 170 units of Product 1, 156 units of Product 2, and 136 units of Product 3. Therefore, the answer for part (2) is:

D = 170 + 156 + 136 = 462

So, the external demand that is satisfied by each of the given production schedules is 200 units for X = 32 and 462 units for X = 136.

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We would need to know the temperature change in Buffalo between the initial temperature and noon in order to determine the temperature at noon.

Temperature is a unit of hotness or coldness that can be defined in terms of any number of arbitrary scales. It indicates the direction in which heat energy will naturally flow, i.e., from a hotter (body) to a colder (body) body.

The given information only provides the initial temperatures in each city and doesn't give any information on the temperature changes. Therefore, it is impossible to determine the temperature in Buffalo at noon based on the given information.

We would need to know the temperature change in Buffalo between the initial temperature and noon in order to determine the temperature at noon.

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The option that allows Mrs. Carlton to pay the lowest interest rate is Option 2, with a total cost of $3,048.00.

Capital: Capital is the initial amount borrowed  or invested. Interest: Interest  is the part of capital that is added to the capital in each  period.  

To determine what reimbursement allows Ms. Carlton pays the lowest interest, we need to calculate the total cost of each option, which includes both principal (the original loan amount) and interest (the cost of borrowing the money). ).

For option 1, the total costs can be calculated as follows:

Total cost = (monthly fee) x (number of payments)

Total cost = $95.00 x $36

Total cost = $3420.00

Therefore, Ms. Carlton would pay a total of $3,420.00 for option #1.

For option 2, the total costs can be calculated as follows:

Total cost = (monthly fee) x (number of payments)

Total cost = $127.00 x $24

Total cost = $3048.00

Therefore, Ms. Carlton would pay a total of $3,048.00 for Option 2.

So  option 2, which allows Mrs. Carlton to pay the lowest interest rate, has a total cost of $3,048.00.

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The volume of each cube is 125 cubic inches.

The volume of all 10 blocks in cubic inches is 1250 cubic inches.

The volume of the toy chest in cubic inches is 1836.75 cubic inches (rounded to two decimal places)

Yes, all 10 blocks will fit into the toy chest.

Since the block is a cube with side 5 inches, the volume of the cube can be calculated using the formula side*side*side.

Therefore, 5 inches*5 inches*5 inches= 125 cubic inches.

The volume of 10 blocks can be calculated by

Volume of one cube x Total number of cubes

= 125 cubic inches x 10= 1250 cubic inches.

Since the toy chest is 12 ⅓ inches by 10 ¾ inches by 12inches.

So, the volume of the toy chest in cubic inches is:

= 12 1/3 in x 10 3/4 in x 12 in

=(37/3) x (43/4) x 12

=1836.75 cubic inches (rounded off to two decimal places)

The volume of all 10 blocks i.e 1250 cubic inches < The volume of the toy chest 1836.75 cubic inches

Therefore, all the 10 blocks will fit in the toy chest.

Answer:

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4 answers

The volume of each cube is 125 cubic inches.

The volume of all 10 blocks in cubic inches is 1250 cubic inches.

The volume of the toy chest in cubic inches is 1836.75 cubic inches (rounded to two decimal places)

Yes, all 10 blocks will fit into the toy chest.

Since the block is a cube with side 5 inches, the volume of the cube can be calculated using the formula side*side*side.

Therefore, 5 inches*5 inches*5 inches= 125 cubic inches.

The volume of 10 blocks can be calculated by

Volume of one cube x Total number of cubes

= 125 cubic inches x 10= 1250 cubic inches.

Since the toy chest is 12 ⅓ inches by 10 ¾ inches by 12inches.

So, the volume of the toy chest in cubic inches is:

= 12 1/3 in x 10 3/4 in x 12 in

=(37/3) x (43/4) x 12

=1836.75 cubic inches (rounded off to two decimal places)

The volume of all 10 blocks i.e 1250 cubic inches < The volume of the toy chest 1836.75 cubic inches

Therefore, all the 10 blocks will fit in the toy chest.

Step-by-step explanation:

To determine if events A and B are mutually exclusive, we will use the concept of probability. Mutually exclusive events are events that cannot occur at the same time, meaning the probability of both events happening together is 0.

If A and B are mutually exclusive, then the probability of either A or B occurring is the sum of their individual probabilities: P(A or B) = P(A) + P(B).

Given: P(A) = 0.69, P(B) = 0.4, and P(A or B) = 0.73.

Let's check if P(A or B) = P(A) + P(B).

0.73 = 0.69 + 0.4
0.73 = 1.09

Since P(A or B) is not equal to the sum of P(A) and P(B), events A and B are not mutually exclusive. Your answer is: No, A and B are not mutually exclusive.

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Carlos harvests cassavas at a rate of approximately 0.43 cassavas per minute.

What is Constant Rate?

In mathematics, a constant rate refers to a consistent or uniform speed or pace at which a particular quantity changes with respect to time or some other variable. It means that the amount of change in the quantity per unit of time is always the same, and does not vary over time or with other conditions.

If Carlos needs 35 minutes to harvest a total of 15 cassavas, we can find his harvesting rate (in cassavas per minute) by dividing the number of cassavas by the time taken:

Harvesting rate = Number of cassavas / Time taken

Harvesting rate = 15 cassavas / 35 minutes

Harvesting rate ≈ 0.43 cassavas per minute

Therefore, Carlos harvests cassavas at a rate of approximately 0.43 cassavas per minute.

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On solving the provided query we have We have 21 dime coins totaling equation 210 cents. We have ten quarters with a vlue of $250.

A mathematical equation is a formula that connects two claims and uses the equals symbol (=) to denote equivalence. An equation in algebra is a mathematical statement that establishes the equivalence of two mathematical expressions. For instance, in the equation 3x + 5 = 14, the equal sign places a space between the variables 3x + 5 and 14. The relationship between the two sentences that are written on each side of a letter may be understood using a mathematical formula. The symbol and the single variable are frequently the same. as in, 2x - 4 equals 2, for instance.

We need to convert $3.99 into cents, which gives us 399 cents, in order to get the least number of coins that are worth exactly the amount of the item. Once we reach 399 cents, we may start adding all the coins we have and counting them.

A) The fewest pennies that are precisely worth the toy's price:

We now have 43 pennies, each worth 43 cents.

We currently have 31 nickels with a value of 155 cents.

We have 21 dime coins totaling 210 cents.

We have ten quarters with a value of $250.

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To get the dimensions of a rectangle with a perimeter of 44 that has the largest area, you should first understand the relationship between the rectangle's sides and its perimeter. The formula for the perimeter of a rectangle is P = 2(l + w), where P is the perimeter, l is the length, and w is the width.

Step:1. Here, the perimeter P = 44, we can write the equation as:
44 = 2(l + w)
Step:2. Solve for l + w:
l + w = 44/2
l + w = 22
Step:3. To maximize the area of the rectangle, the length and width should be as close to each other as possible. In other words, the rectangle should be as close to a square as possible. To achieve this, we can set the length and width to be equal, i.e., l = w.
Step:4. Now, substitute l = w in the equation from step 2:
w + w = 22
2w = 22
Step:5. Solve for w: w = 22/2
w = 11
Step:6. Since l = w, the length l is also 11.
So, the dimensions of the rectangle with the largest area and a perimeter of 44 should be 11 x 11 (length x width, with the smaller value first).

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The matrix A representing the linear transformation T from R3 to R4 with ker(T)={0} and im(T)=V is:

A = [[1, 1, 0],
    [1, 0, 1],
    [-2, 0, 2],
    [0, 0, 4]]

The subspace V is given by the equation x1 - x2 + 2x3 + 4x4 = 0. To find a linear transformation T with kernel {0} and image V, we need to determine a matrix A that sends each basis vector of R3 to a vector in V. We can find a basis for V by solving the given equation for x1, obtaining x1 = x2 - 2x3 - 4x4.

This implies that a basis for V can be {u1 = (1, 1, 0, 0), u2 = (-2, 0, 1, 0), u3 = (0, 0, 2, 4)}. To define the linear transformation T, we map the standard basis of R3 (e1, e2, e3) to the basis vectors of V: T(e1) = u1, T(e2) = u2, and T(e3) = u3. Combining the basis vectors as columns, we obtain the matrix A above.

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The key features the functions f(x) = 4⁻ˣ and g(x) = -√(x - 4) have in common are;

A function is a rule or definition that maps the elements of a set of input variables onto the elements of the set of output variables, such that each input element maps onto exactly one output element.

The functions f(x) = 4⁻ˣ, and g(x) = -√(x - 4), can be analyzed as follows;

The function f(x) can take and is continuous for all values of x, therefore;

The domain of the function, f(x) is (-∞, ∞)

The value of f(x) = 4⁻ˣ, approaches ∞ as x tends to -∞ and 0, as x tends to infinity, therefore;

The range of the function f is (0, ∞)

The domain [4, ∞) is included in the function, f(x) and value of the function decreases in the interval (4, ∞)

The function g(x) = -√(x - 4) has a domain of [4, ∞)

The value of g(x) decreases as the value of x increases, with a max value of 0, and g(x) approaches -∞ as x tends to ∞

The range of g(x) is therefore; [0, -∞)

The key feature f(x) and g(x) have in common is therefore;

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Concept of being risk-averse revolves around an individual's preference for minimizing risk and protecting their assets.

This preference guides them to choose investments with higher expected values, diversify their portfolio, and prioritize maintaining the utility of their wealth over chasing higher, riskier returns.

Concept of being risk-averse refers to an individual's or entity's preference for minimizing risk when making decisions, especially in the context of financial investments or business ventures.

Risk-averse individuals tend to prioritize preserving the value of their assets over the potential for high returns, which may involve taking on substantial risks.
There are three primary aspects to consider in the context of risk aversion:
1. Expected Value: Risk-averse individuals focus on the expected value of an investment, which is the weighted average of possible outcomes.

They prefer investments with higher expected values and lower levels of risk, even if the potential return might be lower compared to riskier investments.
2. Diversification: A common strategy for risk-averse individuals is diversifying their investment portfolio.

By investing in a mix of assets with varying levels of risk and return, they can minimize the overall risk exposure while still achieving some growth potential.
3. Utility: The concept of utility plays a crucial role in understanding risk aversion.

It measures an individual's satisfaction or happiness derived from a particular outcome.

Risk-averse individuals place a higher value on maintaining the utility of their existing wealth rather than pursuing a riskier investment with a higher potential return but also a higher chance of loss.

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The measure of angle ∠DBC is 36 degrees where Segment BD is a diameter, and the measure of arc CB is 36°.

Since BD is the diameter of circle A, it forms a right angle with any chord that intersects it. Therefore, triangle BDC is a right triangle, with angle BDC being the right angle.

Arc CB measures 36 degrees, which is half of the measure of the entire arc CD (since arc CD is subtended by the diameter BD). Therefore, arc CD measures 72 degrees.

Angle BDC is an inscribed angle that intercepts arc CD. The measure of an inscribed angle is equal to half the measure of the intercepted arc. Therefore, angle BDC measures:

1/2 x 72° = 36°

So, the measure of angle ∠DBC is 36 degrees.

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Answer:the measure of angle ∠DBC is 36 degrees.

Step-by-step explanation:FVLS

For (f-9)(x), there seems to be a typo in the question as there is no value 9 involved in the problem.

To find (f+g)(x), we simply add f(x) and g(x):
(f+g)(x) = √(3x - 2) + 1/x
The domain of (f+g)(x) is all real numbers except x = 0 and x < 2/3.

To find (f-g)(x), we subtract g(x) from f(x):
(f-g)(x) = √(3x - 2) - 1/x
The domain of (f-g)(x) is all real numbers except x = 0 and x < 2/3.

To find (fg)(x), we multiply f(x) and g(x):
(fg)(x) = √(3x - 2)/x
The domain of (fg)(x) is all real numbers except x = 0 and x < 2/3.

To find (f/g)(x), we divide f(x) by g(x):
(f/g)(x) = (√(3x - 2))/(1/x) = √(3x - 2) * x
The domain of (f/g)(x) is all real numbers except x = 0 and x < 2/3.

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The travelling distance of B travels a longer distance than A.

we first need to convert the units to a common unit. Let's convert A to feet and B to seconds.

A:

4 feet/second x 60 seconds = 240 feet

B:

6 miles x 5280 feet/mile = 31,680 feet

Travel time = 6 miles / 80 mph = 0.075 hours = 0.075 x 3600 seconds = 270 seconds

Comparing the distances traveled, we see that B travels a longer distance than A.

240 feet (A) < 31,680 feet (B)

So B travels a longer distance than A. 

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Answer:

The Right answer is True

(10C4 x 8C3 x 5C3 = 210 x 56 x 10 = 117,600 pants) × 10 (hats)
Total combinations = 210 (shirts) × 56 , Total combinations = 117,600
So there are 117,600 different ways to choose 4 shirts, 3 pants, and 3 hats from your closet.

For the shirts:
You have 10 shirts and need to choose 4. The combinations formula is C(n, k) = n! / (k! (n-k)!) where n is the total number of items, and k is the number of items to choose from.

C(10, 4) = 10! / (4!(10-4)!)
C(10, 4) = 10! / (4!6!)
C(10, 4) = 210

For the pants:
You have 8 pants and need to choose 3.

C(8, 3) = 8! / (3!(8-3)!)
C(8, 3) = 8! / (3!5!)
C(8, 3) = 56

For the hats:
You have 5 hats and need to choose 3.

C(5, 3) = 5! / (3!(5-3)!)
C(5, 3) = 5! / (3!2!)
C(5, 3) = 10

Now, multiply the combinations for each clothing item together:

Total combinations = 210 (shirts) × 56 (pants) × 10 (hats)
Total combinations = 117,600

So, there are 117,600 different ways to pick what goes in the suitcase.

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Cost of the dinner - d dollars

Tip to leave - 32%

The total money Ariana has to spend is

= d + 32% of d

= d (1 + 32%)

= d ( 1 + 0.32)

= 1.32d

The expression represents the cost of dinner plus tip is 1.32d. Thus, option B is the correct answer.                                                                                  

The cost  of dinner plus tip can be calculated by adding  the cost of dinner to the amount of tip. The amount of tip is 32% of the cost of dinner, which can be expressed as 0.32d.                                                                

Therefore,

d + 0.32d = 1.32d                                                                                                

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The series ∑ 18/n(n+3) is convergent, with the partial sums expressed as a telescoping sum ∑(6/n - 6/(n+3)).

To determine whether the series ∑ 18/n(n+3) is convergent or divergent, we need to express the partial sum Sn as a telescoping sum.

First, let's write out the first few terms of the series

18/3(3+3) + 18/4(4+3) + 18/5(5+3) + 18/6(6+3) + ...

Next, we need to decompose each term into partial fractions

18/n(n+3) = A/n + B/(n+3)

Multiplying both sides by n(n+3), we get

18 = A(n+3) + Bn

Setting n = 0, we get

18 = 3A

A = 6

Setting n = -3, we get

18 = -3B

B = -6

So, we can write

18/n(n+3) = 6/n - 6/(n+3)

Now, we can express the partial sum Sn as a telescoping sum

Sn = (6/1 - 6/4) + (6/2 - 6/5) + (6/3 - 6/6) + ... + (6/n - 6/(n+3))

Notice that the second term in each parenthesis cancels with the first term in the next parenthesis:

(6/1 - 6/4) + (6/2 - 6/5) + (6/3 - 6/6) + ... + (6/n - 6/(n+3))

= 6 - 6/4 - 6/(n+1) - 6/(n+2) - 6/(n+3)

As n approaches infinity, the terms -6/(n+1), -6/(n+2), and -6/(n+3) approach zero. So, we have

lim n→∞ Sn = 6 - 6/4 = 4.5

Since the limit of the partial sums exists and is finite, the series ∑ 18/n(n+3) is convergent.

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The given question is incomplete, the complete question is:

Determine whether the series is convergent or divergent by expressing Sn as a telescoping sum ∑18/n(n+3)

The steps to solving the linear equation is:

A: Subtract 6 from both sides of the equation. The answer is b = 15. Check the solution by substituting 15 for b

A linear equation is one that can go by the definition as an equation whereby the highest power of the variable is always 1. It is also referred to as an equation that has one-degree.

b + 6 = 21

Subtract 6 from both sides of the equation above to result in:

b = 15

Check

15 + 6 = 21

21 = 21

Subtract 6 from both sides of the equation. The answer is b = 15. When we carry out checks, we will get the solution by replacing 15 for b

Thus, those are the steps

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Complete question is:

Which steps are needed to solve this equation? . b + 6 = 21 Subtract 6 from both sides of the equation. The answer is b = 15. Check the solution by substituting 15 for b. Subtract 6 from the left side and add 6 to the right side of the equation. The answer is b = 27. Check the solution by substituting 27 for b. Add 6 to both sides of the equation. The answer is b = 27. Check the solution by substituting 27 for b. Add 6 to the left side and subtract 6 from the right side of the equation. The answer is b = 15. Check the solution by substituting 15 for b.

The value of c that makes 3x + c equivalent to 3(x + 7) is 21.

A mathematical equation is a formula that links two statements and uses the equals sign (=) to indicate equality. In algebra, an equation is a statement that demonstrates the equality of two mathematical expressions. The equal sign divides the variables 3x + 5 and 14 in the equation 3x + 5 = 14, for instance.

We are given that 3x + c is equivalent to 3(x + 7).

To find the value of c, we can expand the right side of the equation using the distributive property:

3(x + 7) = 3x + 21

So we have the equation:

3x + c = 3x + 21

Subtracting 3x from both sides, we get:

c = 21

Therefore, the value of c that makes 3x + c equivalent to 3(x + 7) is 21.

Answer: c = 21

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Answer: and bob has 1 bag with 3 marbles but he has 5 balls altogether.. how does this work?

Step-by-step explanation:

One binder and six packages of paper can be bought by Samantha with her $22

Since we do not know how many binders and packages of paper she bought. So we assume that she bought b no of binders of p no of packages of paper

It's given that Cost of one binder is $4 and the cost of package of paper is $3

We can set up the algebraic equation:

4b + 3p = 22

4b = 22 - 3p

b = [tex]\frac{22 - 3p}{4}[/tex]

If we assume that she bought 6 packages of paper, we can put into equation

b = [tex]\frac{22 - 18}{4}[/tex] = 1 , which means that she bought 1 binder

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