celine ordered a set of beads. she received 10,000 beads in all, 9,100 of the beads were brown. what percentage of the beads were brown?

The Houston Marathon is one of the largest marathon events of the time in Texas. If 1 afar is roughly 1. 61 kilometers, 42.182 kilometers are in 26. 2 long hauls.

The marathon is a long- distance bottom event with a distance of42.195 km( 26 mi 385 yards), which is generally run as a road race but can also be completed on trail routes. Running or a run/ walk strategy can be used to negotiate the marathon.

There are wheelchair divisions as well. Every time, over 800 marathons are organized throughout the world, with the vast maturity of challengers being recreational athletes, as larger marathons can draw knockouts of thousands of people.

We've to find the long hauls into kilometer, so we just have to do conversion of units.

1 mile = 1.61 km

26.2 miles = 1.61 ×26.2 km

= 42.182 km

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8 ounces of chocolate are needed to make a gallon of chocolate milk. The solution has been obtained by using the arithmetic operations.

What are arithmetic operations?

The four basic operations, also referred to as "arithmetic operations," are meant to explain all real numbers. Operations like division, multiplication, addition, and subtraction come before operations like quotient, product, sum, and difference in mathematics.

We are given that for making chocolate milk, in four cups of milk, 2 ounces of chocolate syrup is needed.

It is also given that 1 gallon = 16 cups

So, using multiplication operation gives

⇒ For 16 cups = 2 * 4

⇒ For 16 cups = 8 ounces

Hence, 8 ounces of chocolate are needed to make a gallon of chocolate milk.

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A.  the company should charge approximately $18.08 per unit to sell 2500 units.

B.  Q is measured in thousands, this means the company will sell about 6350 units (rounded to the nearest integer) when the price is set at $8.50 per unit.

(a) To find the price for each unit to sell 2500 units, we need to plug Q = 2.5 (since Q is in thousands) into the demand function P = 26e^(-0.04Q):

P = 26e^(-0.04 * 2.5)

After calculating the value, we get:

P ≈ 18.08

So, the company should charge approximately $18.08 per unit to sell 2500 units.

(b) To find how many units will sell if the price is $8.50, we need to solve the equation P = 26e^(-0.04Q) for Q:

8.50 = 26e^(-0.04Q)

First, we need to isolate the exponential term:

(8.50 / 26) = e^(-0.04Q)

Now, take the natural logarithm (ln) of both sides:

ln(8.50 / 26) = -0.04Q

Next, divide both sides by -0.04:

Q = ln(8.50 / 26) / -0.04

After calculating the value, we get:

Q ≈ 6.35

Since Q is measured in thousands, this means the company will sell about 6350 units (rounded to the nearest integer) when the price is set at $8.50 per unit.

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Step-by-step explanation:

the answer will be "15" according to the question.

The ordered pairs of the system of inequalities are (1, 0) and (0, -5)

From the question, we have the following parameters that can be used in our computation:

6x - y > -3

4x + 3y < 4

The above expression is a system of linear inequality

That implies that we graph the inequalites in the system on the same plane and write out ordered pairs from the region that represent the solution of the system

Next, we plot the graph

See attachment for the graph of the inequality

The ordered pairs are (1, 0), (0, -5) and other pairs

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The murder took place approximately 1.17 hours before the team arrived, which is 8:13 am.

Assuming that the body follows Newton's law of cooling, we can use the formula:

T(t) = Tm + (Ta - Tm) * e^(-kt),

where T(t) is the body temperature at time t, Tm is the temperature of the surrounding medium (in this case, the room), Ta is the initial temperature of the body, and k is a constant that depends on the properties of the body and the surrounding medium.

We can use the information given to find k:

At t = 0 (when the murder took place), T(0) = Ta = unknown

At t = 0.5 hours (30 minutes after the murder), T(0.5) = 85 degrees

At t = 1.5 hours (90 minutes after the murder), T(1.5) = 83.3 degrees

Using the formula above, we can write two equations:

85 = Ta + (72 - Ta) * e^(-0.5k)

83.3 = Ta + (72 - Ta) * e^(-1.5k)

Solving for Ta in the first equation, we get:

Ta = 72 + (85 - 72) / e^(-0.5k) = 72 + 13 / e^(-0.5k)

Substituting this expression for Ta into the second equation, we get:

83.3 = (72 + 13 / e^(-0.5k)) + (72 - (72 + 13 / e^(-0.5k))) * e^(-1.5k)

Simplifying and solving for e^(-0.5k), we get:

e^(-0.5k) = 0.979

the natural logarithm of both sides, we get:

-0.5k = ln(0.979)

Solving for k, we get:

k = -2 * ln(0.979) / 1 = 0.0427

Now we can use the formula again to find Ta:

Ta = 72 + (85 - 72) / e^(-0.5k) = 72 + 13 / e^(-0.5*0.0427) = 78.1 degrees

So the initial temperature of the body was 78.1 degrees.

To find the time of death, we can use the formula again and solve for t when T(t) = 78.1:

78.1 = 72 + (Ta - 72) * e^(-0.0427t)

Substituting Ta = 85 (the initial temperature of the body) and solving for t, we get:

t = -ln((85 - 72) / (78.1 - 72)) / 0.0427 = 1.17 hours

Therefore, the murder took place approximately 1.17 hours before the team arrived, which is 8:13 am.

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Answer: the minimum distance from P to the circle is approximately 2.97, and the maximum distance is approximately 3.89.

Step-by-step explanation:

To find the minimum and maximum distances from the point P(-3, 9) to the circle defined by (x-3)^2 + (y-1)^2 = 25, we can use the fact that these distances are given by the perpendiculars from the point P to the line passing through the center of the circle.

The center of the circle is (3,1), so we can find the equation of the line passing through P and the center of the circle as follows:

The slope of the line passing through P and the center of the circle is (1-9)/(3-(-3)) = -8/6 = -4/3.

Using the point-slope form of a line, the equation of the line passing through P and the center of the circle is y - 9 = (-4/3)(x + 3).

Now we can find the points where this line intersects the circle. Substituting y = (-4/3)(x+3) + 9 into the equation of the circle, we get:

(x-3)^2 + ((-4/3)(x+3) + 8)^2 = 25

Expanding and simplifying this equation gives a quadratic equation in x:

25x^2 + 96x + 80 = 0

Solving this quadratic equation using the quadratic formula, we get:

x = (-96 ± sqrt(96^2 - 42580)) / (2*25)

x = (-96 ± 56) / 50

x = -2.04 or x = -1.52

Substituting these values of x into y = (-4/3)(x+3) + 9 gives the corresponding values of y:

When x = -2.04, y = 6.24

When x = -1.52, y = 7.27

So the two points of intersection are approximately (-2.04, 6.24) and (-1.52, 7.27).

Finally, we can find the distances from P to each of these points using the distance formula:

The distance from P to (-2.04, 6.24) is sqrt[(-3 - (-2.04))^2 + (9 - 6.24)^2] ≈ 3.89.

The distance from P to (-1.52, 7.27) is sqrt[(-3 - (-1.52))^2 + (9 - 7.27)^2] ≈ 2.97.

Therefore, the minimum distance from P to the circle is approximately 2.97, and the maximum distance is approximately 3.89.

Answer:

168

Step-by-step explanation:

Volume is the ''area'' of a 3d shape

to find the volume, multiply the length, width, and height of the shape.

6x7x4

=42x4

=168 cubic yards

hope it helps

pls mark brainliest!!!

Answer:

168 cubic yards

Step-by-step explanation:

The formula for a rectangular prism volume is:

[tex]V=lwh[/tex]

Since we have all 3, the length, the width, and the height, we can plug in the numbers to substitute:

V=6·7·4

=168

So, the volume of this rectangular prism is 168 cubic yards.

Hope this helps :)

Equation of new function when vertically compressing the absolute value of parent function by a factor of 4 is option d. g(x) = (1/4)|x|.

The absolute value parent function is f(x) = |x| .

f(x) = x when x is positive,

and f(x) = -x when x is negative.

To vertically compress the function by a factor of 4,

Multiply the function by 1/4.

This implies,

The equation of the new function is equal to,

g(x) = (1/4) × f(x)

      = (1/4) × |x|

      = (1/4) × x when x is positive,

and g(x) = (1/4) × (-x)

             = (-1/4) × x when x is negative.

This implies,

g(x)=  (1/4) × f(x)

      = (1/4) |x|

(1/4) x for x ≥ 0

(-1/4) x for x < 0

Therefore, the equation of the new function is equal to option d. g(x) = (1/4)|x|.

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The above question is incomplete, the complete question is:

If you vertically compress the absolute value parent function, f(x) = |x|, by a factor of 4, what is the equation of the new function?

a. g(x) = 4x

b. g(x) = 4x -1

c. g(x) = x - 4

d. g(x) = (1/4)|x|

In 1981 number of ways a committee of five members of the department if at least one woman must be on the committee.

By choosing some items from a set and creating subsets, permutation and combination are two approaches to express a collection of things. It outlines the numerous configurations for a certain set of data. Permutations are the selection of data or objects from a set, whereas combinations are the order in which they are represented. Both ideas are critical to mathematics.

The number of ways of picking 5 from 14 is what the question is actualy asking minus combinations of 5 from 7 , because there must be 1 woman

so 5 from 14 is given by :

= [tex]\frac{14*13*12*11*10}{5*4*3*2*1}[/tex]

which is :

14 x 13 x 11 = 2002

combinations of 5 from 7 is :

(9x8x7x6x5) / (5x4x3x2x1)

[tex]\frac{7*6*5*4*3}{5*4*3*2*1}[/tex]

which is :

7 x 3= 21

so the final answer is 2002 - 21 = 1981.

Therefore, in 1981 ways a committee of five members of the department if at least one woman must be on the committee.

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Based on Elena's solution, x represents the number of movies that can be downloaded. However, her inequality is incorrect as it states that the total amount of downloaded data (8x + 58) is greater than or equal to the total capacity of the hard drive (500 gigabytes).

This means that Elena is considering the amount of data taken up by other files in addition to the movies she wants to download. Therefore, her solution of x ≥ 55.25 is incorrect as it would allow Elena to download more movies than the remaining capacity of the hard drive.

The corrected inequality should be 8x ≤ 442, as the remaining capacity of the hard drive is 500 - 58 = 442 gigabytes. This means that Elena can download a maximum of 55 movies (8 x 55 = 440), leaving 2 gigabytes of space remaining on the hard drive. Therefore, each part of the inequality represents the total amount of data used by the movies downloaded (8x) and the remaining capacity of the hard drive (442).

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The antiderivative of h(x) is 5x + C.

We can simplify the function y as y = 1 + 3x^4. Now, we can integrate term by term as:

∫ y dx = ∫ (1 + 3x^4) dx

= x + (3/5)x^5 + C

So, the antiderivative of y is x + (3/5)x^5 + C.

The antiderivative of cos(x) is sin(x) and the antiderivative of x is (1/2)x^2. Therefore, we can integrate term by term as:

∫ g(x) dx = ∫ (cos x + x) dx

= sin(x) + (1/2)x^2 + C

So, the antiderivative of g(x) is sin(x) + (1/2)x^2 + C.

The antiderivative of any constant is the constant times x. Therefore, we can integrate h(x) as:

∫ h(x) dx = ∫ 5 dx

= 5x + C

So, the antiderivative of h(x) is 5x + C.

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The p-value is 0.00012 which is less than the significance level (α = 0.1), we reject the null hypothesis and conclude that there is sufficient evidence to support the alternative hypothesis that the true population proportion is different from 0.77.

The hypothesis being tested is:

H0: p=0.77 (null hypothesis)

H1: p≠0.77 (alternative hypothesis)

where p is the true population proportion.

The test statistic for this hypothesis test is the z-score, which can be calculated using the formula:

z = (x - np) / sqrt(np(1-p))

where x is the number of successes, n is the sample size, and p is the hypothesized proportion under the null hypothesis.

In this case, n = 500, x = 370, and p = 0.77. Plugging these values into the formula, we get:

z = (370 - 500 * 0.77) / sqrt(500 * 0.77 * 0.23)

z ≈ -3.81

The p-value for this test is the probability of obtaining a z-score more extreme than -3.81, assuming the null hypothesis is true. Since this is a two-tailed test, we need to calculate the area in both tails of the standard normal distribution. Using a standard normal distribution table or a calculator, we find that the area in each tail is approximately 0.00006.

Therefore, the p-value is:

p-value ≈ 2 * 0.00006 = 0.00012

In terms of practical interpretation, we can say that there is evidence to suggest that the proportion of successes is significantly different from 0.77 in the population from which the sample was drawn.

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If the sum of the roots of a quadratic equation is 1 and the product of the roots is -35/4 and the equation is [tex]4x^2-4x-35=0[/tex] and the roots are 3.5 and -2.5

If the quadratic equation is [tex]ax^2+bx+c=0[/tex]

The sum of the roots = [tex]-\frac{b}{a}[/tex]

The product of the roots = [tex]\frac{c}{a}[/tex]

Sum of the roots = 1 = [tex]-\frac{b}{a}[/tex]

Product of the roots = [tex]-\frac{35}{4}[/tex] = [tex]\frac{c}{a}[/tex]

If we assume a as 1, then the equation comes out to be:

[tex]x^2-x-\frac{35}{4} =0[/tex]

Multiply the equation by 4 to get a simplified equation:

[tex]4x^2-4x-35=0[/tex]

[tex]4x^2[/tex] - 14x + 10x - 35 = 0

2x (2x - 7) + 5 (2x - 7) = 0

(2x - 7)(2x + 5) = 0

x = 3.5 and -2.5

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Check the picture below.

The judge in this scenario is acquitting all defendants regardless of the evidence.

If the judge decides to acquit all defendants, regardless of the evidence, then the probability of a Type I error would be 1, meaning that the judge will always reject the null hypothesis (that the defendant is guilty) when it is actually true.

A Type I error occurs when we reject a null hypothesis that is actually true. In the context of a criminal trial, this would mean that the judge is acquitting a defendant who is actually guilty.

In statistical hypothesis testing, we typically set a threshold (called the "level of significance") for the probability of making a Type I error. The most commonly used level of significance is 0.05, which means that we are willing to accept a 5% chance of making a Type I error.

However, if the judge in this scenario is acquitting all defendants regardless of the evidence, then the probability of making a Type I error would be 1, which is much higher than the typically acceptable level of significance.

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The probability that there will be at least 4 typos on page 301 is 0.847

To solve this problem, we need to make some assumptions. Let's assume that the number of typos on each page follows a Poisson distribution with a mean of 6 typos per page, and that the number of typos on one page is independent of the number of typos on any other page.

Under these assumptions, we can use the Poisson distribution to calculate the probability of observing a certain number of typos on a given page.

Let X be the number of typos on page 301. Then X follows a Poisson distribution with a mean of 6 typos per page. The probability of observing at least 4 typos on page 301 can be calculated as follows

P(X ≥ 4) = 1 - P(X < 4)

= 1 - P(X = 0) - P(X = 1) - P(X = 2) - P(X = 3)

Using the Poisson distribution formula, we can calculate the probabilities of each of these events

P(X = k) = (e^-λ × λ^k) / k!

where λ = 6 and k is the number of typos. Thus,

P(X = 0) = (e^-6 × 6^0) / 0! = e^-6 ≈ 0.0025

P(X = 1) = (e^-6 × 6^1) / 1! = 6e^-6 ≈ 0.015

P(X = 2) = (e^-6 × 6^2) / 2! = 18e^-6 ≈ 0.045

P(X = 3) = (e^-6 × 6^3) / 3! = 36e^-6 ≈ 0.091

Plugging these values into the equation above, we get

P(X ≥ 4) = 1 - (e^-6 + 6e^-6 + 18e^-6 + 36e^-6)

≈ 0.847

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The red arc or chord in the key of C, or the solution to the provided question based on the circle, is 11.

A chord is a piece of a straight line that connects two points on a circle's circumference. When it crosses the circle at two different locations, it is also occasionally referred to as a secant.

The following formula can be used to determine a chord's length:

chord length = 2*radius*sin(angle/2)

where angle is the central angle that the chord is subtended by, and radius is the radius of the circle. In geometry and trigonometry, chords are frequently used to compute circle properties including area, circumference, and arc length.

Since the circle P ≅ circle C

In circle P the radius of PN =7 and

chord LM = 11 with an angle 104°

And  In circle C  the radius =7 and Circle and chord QR are both making the same angle. P = 104°

So the circle P ≅ circle C

The red arc or chord in C is consequently 11.

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When estimating population parameters, a point estimate is: a population parameter

Point estimates are statistical estimates used to approximate population parameters such as mean, proportion or variance that remain unknown.

They provide one value as an approximation for unknown parameters in a population sample that may or may not match up exactly with true population value; nevertheless they serve as reasonable approximations.

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The perimeter of the rectangle with a length of 10 feet and breadth of 11 feet is 42 feet.

In a rectangle, opposite sides are equal in length. So, you have two pairs of sides that are equal. The length of the two equal sides is given by l, which is 10 feet, and the length of the other two equal sides is given by b, which is 11 feet.

Therefore, to find the perimeter of the rectangle, you need to add up the length of all four sides:

Perimeter = 2(l + b)

Substituting the given values of l = 10 feet and b = 11 feet, we get:

Perimeter = 2(10 + 11) feet

Simplifying the expression inside the parentheses, we get:

Perimeter = 2(21) feet

Multiplying 2 and 21, we get:

Perimeter = 42 feet

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Complete Question:

Directions: find the perimeter of each rectangle. be sure to include the correct unit.

Where l = 10 feet and b = 11 feet.

Step-by-step explanation:

x is the radius.....y is the diameter ...which is two times  'x'

find 'x' via the Pythagorean theorem

x^2 = 3.6^2 + 4^2

x = 5.38

y = 2x = 10.76  units

Answer:

= 112.5π sq. units is the area of pi

Step-by-step explanation:

In your case it's 15π

So that becomes:

2πr=15π

Now dividing the equation on both sides by π,the result is:

2r=15

That means 2 times radius(r) is 15

r=15/2

r computes out to be 7.5

Now r=7.5

So the area of circle(AoC) i.e. πr^2

AoC=3.14*(7.5)^2

AoC=3.14*(7.5)*(7.5)

AoC=176.625

Note: Don't forget to multiply the result to respective unit square for e.g. if the circumference was 15π in cm then the Area would compute out as 176.625 cm^2

Answer: Linear Function: y = -10x + 15    Exponential Function:  

y = 15(1/3)(to the power of x)

Step-by-step explanation:

Linear Function:

First we need to find the slope by using the slope equation: (y2 - y1)/(x2 - x1)

In which, it should be (5 - 15)/(1 - 0)

So, we know that the slope is -10, and we already know that the y-intercept is 15, so, we are going to plug it in to the slope-intercept formula, which is

y = mx + b,

In which, it would become y = -10x + 15

Exponential Function =

The exponential function is y = ab(to the power of x)

Let's list out the points onto the equation, 15 = ab(0) and 5 = ab(1)

Know let's solve for each variable.

1. 15 = ab(0)

2. 15/b(0) = a

3. 15 = a

Know we know that a is 15, we can solve for b.

1. 5 = (15)b(1)

2. 5/15 = b(1)

3. 1/3 = b

Know we know that b is equal to 1/3, let's plug it into the equation.

y = 15(1/3)(to the power of x)

Based on the AHP analysis, Smith is predicted to win the school board election.

This inconsistency is measured by the consistency ratio. It serves as a gauge for how much consistency you depart from. When your tastes are 100 percent constant, the deviation will be 0.

To determine the winning candidate, we need to calculate the overall weighted score for each candidate by multiplying their scores in each factor by the corresponding weight and adding up the results. The candidate with the highest overall weighted score is the predicted winner.

Using the given comparison matrices and weights, we can calculate the overall weighted scores for each candidate as follows:

For Ivy:

Overall weighted score = (2*0.33) + (3*0.45) + (2*0.22) = 2.06

For Bahrn:

Overall weighted score = (5*0.33) + (1*0.45) + (2*0.22) = 2.01

For Smith:

Overall weighted score = (2*0.33) + (4*0.45) + (3*0.22) = 2.54

Therefore, based on the AHP analysis, Smith is predicted to win the school board election.

To assess the consistency of the decision, we can calculate the consistency ratio (CR) using the following formula:

CR = (CI - n) / (n - 1)

where CI is the consistency index and n is the number of criteria (in this case, 3).

The consistency index is calculated as follows:

CI = (λmax - n) / (n - 1)

where λmax is the maximum eigenvalue of the comparison matrix.

For the left comparison matrix, the eigenvalue is 3.08, for the center comparison matrix, the eigenvalue is 3.00, and for the right comparison matrix, the eigenvalue is 2.92. The average of these eigenvalues is 2.97.

Therefore, CI = (2.97 - 3) / (3 - 1) = -0.015

The random index (RI) for n=3 is 0.58.

Therefore, CR = (-0.015 - 3) / (3 - 1) = -1.5

Since CR is negative, it indicates that there is inconsistency in the pairwise comparisons made by the voters. This suggests that the AHP analysis may not be a reliable method for predicting the election outcome in this case.

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Joe would need to successfully kick 11 consecutive field goals to raise his success rate to 49%.

Let's use the given terms and solve the problem step by step.

1. Joe's current success rate: He made 7 out of 26 field goal kicks.
2. Desired success rate: 49%

Let's use 'x' as the number of consecutive field goals Joe needs to make to reach a 49% success rate.

Step 1: Calculate the total number of kicks after making 'x' consecutive goals.
Total kicks = 26 (previous kicks) + x (consecutive goals)

Step 2: Calculate the total number of successful kicks after making 'x' consecutive goals.
Successful kicks = 7 (previous successful kicks) + x (consecutive successful goals)

Step 3: Calculate the success rate (total successful kicks / total kicks) and set it equal to 49%.
(Successful kicks / Total kicks) = 49/100

Step 4: Substitute the expressions from Steps 1 and 2 into the equation from Step 3.
(7 + x) / (26 + x) = 49/100

Step 5: Solve for 'x'.
49 * (26 + x) = 100 * (7 + x)

1274 + 49x = 700 + 100x
49x - 100x = 700 - 1274
-51x = -574

x = 574 / 51
x ≈ 11.25

Since Joe cannot make a fraction of a goal, he needs to make 12 consecutive field goals to reach a success rate of at least 49%.

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When allowing repetition, you can make 676,000 passwords, and without repetition, you can make 468,000 passwords.

To create a password that starts with two letters from the alphabet, followed by three digits (for example, AB-123), you can make a different number of passwords depending on whether you are allowed to repeat letters or numbers.

1. If you are allowed to repeat letters or numbers, you can make:
- 26 (alphabet letters) x 26 (alphabet letters) x 10 (digits 0-9) x 10 (digits 0-9) x 10 (digits 0-9) = 676,000 passwords.

2. If you don't repeat any letters or numbers, you can make:
- 26 (alphabet letters) x 25 (remaining alphabet letters) x 10 (digits 0-9) x 9 (remaining digits 0-9) x 8 (remaining digits 0-9) = 468,000 passwords.

Your answer: When allowing repetition, you can make 676,000 passwords, and without repetition, you can make 468,000 passwords.

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Answer: 72 m²

Step-by-step explanation:

The proportion that can be used to show that the slope of uw is equal to the slope of wy is B) 2-8 -1-2.

Let the angles opposite to sides UV, VW, and WU be denoted by theta1, theta2, and theta3, respectively, in triangle UVW. Similarly, let the angles opposite to sides WY, YX, and XW be denoted by theta4, theta5, and theta6, respectively, in triangle WXY. Since triangles UVW and WXY are similar right triangles, we have:

theta1 = theta4 = 90 degrees (both triangles are right triangles)

theta2 = theta5 (corresponding angles in similar triangles are equal)

theta3 = theta6 (corresponding angles in similar triangles are equal)

UW/VW = WY/YX (sides in similar triangles are proportional)

The slope of uw is given by the rise over run or (VU - UW)/(WV), and the slope of wy is given by the rise over run or (XY - WY)/(YW). Using the similar triangles proportion, we can substitute UW/VW = WY/YX and simplify to get (VU - UW)/(WV) = (XY - WY)/(YW). This equation shows that the slope of uw is equal to the slope of wy.

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The amount of Pure alcohol must a pharamacist add to 10cm cubed of a 8% alcohol solution to strengthen it to a 80% solution is 36 cm³.

Alcohol, also known as ethanol is a clear, colorless liquid that is produced by the fermentation of sugars and carbohydrates by yeasts.

Let's start by writing down the equation that relates the amount of alcohol in the original 8% solution to the amount of alcohol in the final 80% solution:

0.08x(10 +x)

Here, x represents the amount of pure alcohol that we need to add to the 10 cm³ of 8% solution to obtain the desired 80% solution.

The left-hand side of the equation represents the amount of alcohol in the original solution (which is 8% alcohol), while the right-hand side represents the amount of alcohol in the final solution (which is 80% alcohol).

Now we can solve for x:

0.08 x (10 + x) = 0.08x(10+x)

0.2x = 7.2

x = 36 cm³.

Therefore, the pharmacist must add  of pure alcohol to the  of 8% alcohol solution to obtain an 80% alcohol solution.

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