Anyone know how to solve this

Answer:

Step-by-step explanation:

i can't see graph.

[tex]f(x)=-x^2-2x+15=-(x^2+2x+1-1)+15=-(x-1)^2+1+15=-(x-1)^2+16\\domain=all~real~numbers.\\[/tex]

Range≤16

so A

The domain is all real numbers. The range is y less then or equal to 16.

Quadratic function is a polynomial of degree 2. It is in the form:

f(x) = ax² + bx + c

where a, b, c are constants

The domain of a function is the set of input variables while the range of a function is the set of output variables.

From the image attached, The domain is all real numbers. The range is y less then or equal to 16.

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Answer:

At the maxium point

Step-by-step explanation:

A maxium point is a point where the function gets the higher value. For example, in the basic sine curve, we can find a maxium point when [tex]x=\frac{\pi }{2}[/tex]. We won't find any maxium point when x=0.

As you can see on the graph I attached, the zeros of a basic sine curve (or, said in other words, the points were x=0), are at the beginning, ath the middle and at the end of the function's graphic.

Answer:  (1) 14.4%   (2) 3.78%   (3) $222.48     (4) 21,176.47    

               (5) $425    (6) 14.3 cents per mile

Step-by-step explanation:

1) This is a calculator question. I = 0.144    --> 14.4%

[tex]A=P\bigg(1+\dfrac{r}{n}\bigg)^{nt}\\\\\bullet \text{A = Accrued amount (total amount paid)}\\\bullet \text{P = Principal (initial cost of the car)}\\\bullet \text{r = rate (interest rate in decimal form)}\\\bullet \text{n = number of times in a year (number of months)}\\\bullet \text{t = number of years}\\\\A = m \times nt\\\bullet \text{m = monthly payment amount}\\\bullet \text{nt = number of payments made}\\\implies m\times nt=P\bigg(1+\dfrac{r}{n}\bigg)^{nt}[/tex]

2) m = 93.33

   nt = 36

   P = 3000

   n = 12

[tex]m\times nt=P\bigg(1+\dfrac{r}{n}\bigg)^{nt}\\\\\\93.33\times 36=3000\bigg(1+\dfrac{r}{12}\bigg)^{36}\\\\\\3359.88=3000\bigg(1+\dfrac{r}{12}\bigg)^{36}\\\\\\1.11996=\bigg(1+\dfrac{r}{12}\bigg)^{36}\\\\\\1.00315198=1+\dfrac{r}{12}\\\\\\0.00315198=\dfrac{r}{12}\\\\\\0.0378=r\\\\\\\large\boxed{3.78\%}=r[/tex]

3) same equation as #2 but deduct the down payment from the Principal

   nt = 42

   P - d = 5,555 - 555 = 5,000

   r = 18% --> 0.18

   n = 12

[tex]m\times nt=P\bigg(1+\dfrac{r}{n}\bigg)^{nt}\\\\\\m\times 42=(5,555-555)\bigg(1+\dfrac{.18}{12}\bigg)^{42}\\\\\\42m=5000(1.015)^{42}\\\\\\42m=5000(1.868847)\\\\\\42m=9344.23557\\\\\\m=\large\boxed{222.48}[/tex]

4)  Gas  +  Oil  = cost per mile × number of miles

   1000 + 800 = 0.085x

               1800 = 0.085x

        [tex]\large\boxed{21,176.47}=x[/tex]

5)  [tex]\text{Annual Depreciation}=\dfrac{\text{Cost of car - Trade-in value}}{\text{Years driven}}[/tex]

[tex].\qquad =\dfrac{3800-1250}{6}\\\\\\.\qquad =\dfrac{2550}{6}\\\\\\.\qquad = \large\boxed{425}[/tex]

6) [tex]\dfrac{\text{(Cost of car - Market value) + Gas & Oil + Parts, Maintenance + Insurance}}{\text{Miles driven}}[/tex]

[tex]=\dfrac{(5000-3800)+750+250+300}{17,500}\\\\\\=\dfrac{2500}{17,500}\\\\\\=0.142857\\\\=\large\boxed{14.3\ cents\ per\ mile}[/tex]

Answer:

  y DOES NOT vary directly with x

Step-by-step explanation:

If variation is direct, the ratio of y to x is a constant. Here, we have ...

  11/7 ≠ 13/8

so variation is not direct.

___

It appears that y = 2x-3, rather than y = kx for some k. The added constant (-3) means variation is not direct.

To determine if y varies directly with x, we calculate the ratios between the corresponding values. The ratios are approximately constant, so y varies directly with x. The equation representing the direct variation is y = 1.57x.

To determine whether y varies directly with x, we need to check if the ratio between the corresponding values of y and x is constant. Let's calculate the ratio for each pair of values:

Since the ratios are approximately constant, we can conclude that y varies directly with x. To find the constant of variation (k), we can choose any of the ratios. Let's take the ratio from the first pair: 11/7 ≈ 1.57. Therefore, the equation that represents the direct variation is y = 1.57x.

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The statement 'If x=3, then x−3=0' is justified by the Subtraction Property of Equality. This property allows you to subtract the same value from both sides of an equation while maintaining equality.

The statement 'If x=3, then x−3=0' is justified by the Subtraction Property of Equality. This property states that if you subtract the same number from both sides of an equation, the equation remains equal. So, in this case, you start with x=3 and then you subtract 3 from both sides to get x-3=0. It's also important to note that the other properties mentioned, Division, Reflexive, and Multiplication, aren't appropriate in this scenario because no division, reflexion or multiplication operation is being performed.

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Answer:

Well, if the grip is 75 x 75, you can rule out that the grid is 75 squares in each border.

Step-by-step explanation:

75 x 75 = a x b

a= horizontal side lengths

b= vertical side lengths

Rule that a= 75 squares and b= 75 squares.

Answer:

  24 209/300 m ≈ 24.69667 m ≈ 24.70 m

Step-by-step explanation:

The total height is the sum of the above-ground height and the below-ground depth:

  6 5/12 m + 18.28 m = (6 + 18) m + (5/12 + 7/25) m

  = 24 m + (125+84)/300 m

  = 24 209/300 m ≈ 24.6966666... m ≈ 24.70 m

_____

The problem statement does not say what rounding is required. The least-resolution number is 18.28, with resolution of 1 cm, so the answer might rightly be rounded to that resolution: 24.70 m. If we take the numbers to be exact, their sum can only be represented exactly as the ratio of integers or a mixed number or a repeating decimal.

Answer:

save 100$ each check.

Step-by-step explanation:

Answer:

I will save $2,600 in one year by depositing $50 dollars per week in a savings account.

Step-by-step explanation:

When you set a goal, it should clearly state what you want to accomplish, it has to be measurable and relevant according to what you want to do. Also, it has to establish a deadline and it should be something that you can achieve.

According to this and the options given, the goal that would be most helpful for Caleb is I will save $2,600 in one year by depositing $50 dollars per week in a savings account because it is well defined, it is measurable and establishes a deadline as he will save $50 dollars per week to get $2600 in a year. Additionally, the goal can be accomplished and it is relevant to what he wants to do that is to save money for living expenses because he is going to college next year.

Answer:

Solution: -4, 4

Step-by-step explanation:

You need to do 2 cases:

Case 1: [tex]y\geq 0[/tex]

[tex]When\ y\geq 0 => | y | = y[/tex]

y - 19 = -15

y = 19 - 15

y = 4

Case 2: [tex]y< 0[/tex]

[tex]When\ y < 0 => |y| = -y[/tex]

-y -19 = -15

-19 + 15 = y

-4 = y

Both are solutions of the equation.

Answer:

-4, 4 would be your answer

Step-by-step explanation:

The cheapest cost to fill the Paolo's tank = $33.75

We have Paolo who bought a used car for $3,500 and wants to fill it up with gasoline. His gas tank holds 15 gallons and is currently empty. Paolo has $100. One gas station sells gas for $2.50 per gallon. The station across the street sells gas for $2.25 per gallon.

We have to determine the cheapest cost to fill up Paolo's tank.

The price estimation is important in mathematics as it helps us to create mathematical relations among the various factors on which the price depends in order to extract accurate results.

According to question, we have -

Cost of Car = $3500.

Car's gasoline capacity = 15 gallons.

Amount of money with Paolo = $100.

Cost of gas at station A = $2.25.

Cost of gas at station B = $2.50.

Case 1 - If Paolo goes to Station A

Total cost to fill the tank = 2.25 x 15 = $33.75

Case 2 - If Paolo goes to Station B

Total cost to fill the tank = 2.50 x 15 = $37.50

Hence, the cheapest cost to fill the Paolo's tank = $33.75

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130+x/5=70+3x/10 x=400

Answer: Last option.

Step-by-step explanation:

Observe the figure attached.

In order to find the value of "b", you need to remember the definition of "Alternate interior angles". These are the pairs of angles located in the interior of the parallel lines and on opposite side of the transversal. They are congruent.

Based on this definition, you can conclude that the angle "b" and the angle that measures 128° are Alternate interior angles; therefore they are congruent.

This means that the value of "b" is:

[tex]b=128\°[/tex]

Answer:

The last answer!

Step-by-step explanation:

edge 2020

Answer:

The answer is (C) 8

Step-by-step explanation:

First, let's calculate the length of the side of the square.

[tex]A_{square}=a^2[/tex], where [tex]a[/tex] is the length of the side. Now, let's try to build the square. First we need to find a point which distance from (0, 0) is 10. For this, we can use the distance formula in the plane:

[tex]d = \sqrt{(x_2-x_1)^2 + (y_2-y_1)^2}[/tex] which for [tex]x_1=0[/tex] and [tex]y_1 = 0[/tex] transforms as  [tex]d=\sqrt{(x_2)^2 + (y_2)^2}[/tex]. The first point we are looking for is connected to the origin and therefore, its components will form a right triangle in which, the Pythagoras theorem holds, see the first attached figure. Then, [tex]x_2[/tex], [tex]y_2[/tex] and 10 are a Pythagorean triple. From this, [tex]x_2= 6[/tex] or  [tex]x_2=8[/tex] while [tex]y_2= 6[/tex] or [tex]y_2=8[/tex]. This leads us with the set of coordinates:

[tex](\pm 6, \pm 8)[/tex] and [tex](\pm 8, \pm 6)[/tex].  (A)

The next step is to find the coordinates of points that lie on lines which are perpendicular to the lines that joins the origin of the coordinate system with the set of points given in (A):

Let's do this for the point (6, 8).

The equation of the line that join the point (6, 8) with the origin (0, 0) has the equation [tex]y = mx +n[/tex], however, we only need to find its slope in order to find a perpendicular line to it. Thus,

[tex]m = \frac{y_2-y_1}{x_2-x_1} \\m =  \frac{8-0}{6-0} \\m = 8/6[/tex]

Then, a perpendicular line has an slope [tex]m_{\bot} = -\frac{1}{m} = -\frac{6}{8}[/tex] (perpendicularity condition of two lines). With the equation of the slope of the perpendicular line and the given point (6, 8), together with the equation of the distance we can form a system of equations to find the coordinates of two points that lie on this perpendicular line.

[tex]m_{\bot}=\frac{6}{8} = \frac{8-y}{6-x}\\ 6(6-x)+8(8-y)=0[/tex]  (1)

[tex]d^2 = \sqrt{(y_o-y)^2+(x_o-x)^2} \\(10)^2=\sqrt{(8-y)^2+(6-x)^2}\\100 = \sqrt{(8-y)^2+(6-x)^2}[/tex]   (2)

This system has solutions in the coordinates (-2, 14) and (14, 2). Until here, we have three vertices of the square. Let's now find the fourth one in the same way we found the third one using the point (14,2). A line perpendicular to the line that joins the point (6, 8) and (14, 2) has an slope [tex]m = 8/6[/tex] based on the perpendicularity condition. Thus, we can form the system:

[tex]\frac{8}{6} =\frac{2-y}{14-x} \\8(14-x) - 6(2-y) = 0[/tex]  (1)

[tex]100 = \sqrt{(14-x)^2+(2-y)^2}[/tex]  (2)

with solution the coordinates (8, -6) and (20, 10). If you draw a line joining the coordinates (0, 0), (6, 8), (14, 2) and (8, -6) you will get one of the squares that fulfill the conditions of the problem. By repeating this process with the coordinates in (A), the following squares are found:

Now, notice that the equation of distance between the two points separated a distance of 10 has the trivial solution [tex](\pm10, 0)[/tex] and  [tex](0, \pm10)[/tex]. By combining this points we get the following squares:

See the attached second attached figure. Therefore, 8 squares can be drawn  

Answer:

This is random sampling.

Step-by-step explanation:

Given condition is - In a poll, 809 adults were called after their telephone numbers were randomly generated by a​ computer, and 20 % were able to correctly identify the secretary of state.

This research center used random sampling.

Random because the telephone numbers were randomly generated by the computer. It could have been any number and any person.

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

Other sampling methods either use groups to conduct survey or survey the easiest available sample as in convenience sampling. So, rest options are wrong.

Therefore, it is random sampling.

Answer: Jane started growing Sphere 3 hours ago

Step-by-step explanation:

Farm Rod starting population (Rsp) = 2

Farm Sphere starting population (Ssp) = 8

Let´s name "Rh" the quantity of hours since Rod started growing, and

"Sh" the quantity of hours since Sphere started growing.

And, let´s name "R" the population of farm Rod at 8 p.m. and "S" the population of farm Sphere at 8 p.m.

Population of Rod doubles every hour, therefore:

R = [tex]Rsp * 2^{Rh}[/tex]

R = [tex]2(2^{Rh})[/tex]

Population of Sphere is quadrupled every hour, therefore:

S = [tex]Ssp * 4^{Rh}[/tex]

S = [tex]8(4^{Rh})[/tex]

At 8 p.m. Jane found that R = S

Therefore, at 8 p.m:

[tex]2(2^{Rh})[/tex] = [tex]8(4^{Sh})[/tex]

dividing both sides by 2

[tex]2^{Rh} =4(4^{Sh})[/tex]

adding exponents

[tex]2^{Rh} = 4^{Sh+1}[/tex]

[tex]2^{Rh} =2^{2^{Sh+1} }[/tex]

the bases are the same; exponents must be the same

Rh = 2Sh + 2    (equation 1)

And we also know that Jane started growing Rod five hours before Sphere:

Rh = Sh + 5    (equation 2)

Replacing equation 2 into equation 1:

(Sh + 5) = 2Sh + 2

5 - 2 = 2Sh - Sh

3 = Sh, or

Sh = 3

Jane started growing Sphere 3 hours ago.  

Answer:

If the length of the garden is (x + 5) then the width will be (x + 3)

The area of the garden is 48 sq feet

Step-by-step explanation:

The garden is x^2 + 8x + 15 sq feet

Use the factorization method and break the middle term:

x^2+3x+5x+15

Group the first two terms and last two terms:

(x^2+3x)+(5x+15)

Take out the common from each pair.

x(x+3) +5(x+3)

(x+5)(x+3)

We have already been given that x+5 is the length. Then this shows that x+5 is the length and x+3 is the width

If the length of the garden is (x + 5) then the width will be (x + 3)

The method I used is the F.O.I.L. method

The letters FOIL stand for First, Outer, Inner, Last. First means multiply the terms which occur first in each binomial. Then Outer means multiply the outermost terms in the product.

(x + 5)(x + 3) = x^2 + 3x + 5x + 15

Solve the like terms:

= x^2 + 8x + 15

b) x= 3 feet

(x + 5)(x + 3)

Substitute the value in the expression

(3 + 3)(5 + 3)= (8)(6)= 48 square feet

Area of the garden is 48 sq feet.

Answer:

Descriptive statistics

Explanation:

The population average is a descriptive statistic. It informs about how the population looks like, in this case, the population looks like having a average of 1000.

If, using her class's average where to infer the population average that is inferential statistic. But that is not the case

Answer:

  2237

Step-by-step explanation:

84 = 2·2·3·7 . . . . . . prime factorization

Answer:

Answer is B) control group

Step-by-step explanation:

Survey is when you ask questions to a group of people. Has nothing to do in this case. Correlational does not exist but correlation means the association between two groups.

In an experiment, you apply a treatment, or a conditions that differentiates groups and measure an outcome . In this case the treatment is drinking alcohol to measure memory. The group that receives the treatment is the experimental group and the one that not receives the treatment is the control because, we are comparing or controlling alcohol consumption in this group to measure differences in memory with the experimental group.

Answer:

2.67 bushels of corn

Step-by-step explanation:

We can see it in the picture.

Answer:

The roots are:

a) z1 = 0

b) z2 = -2

c) z3 = ∛2 or 1.26

Step-by-step explanation:

First we factor z from the original equation

       z⁷ + 6z⁴ - 16 z = z ( z⁶ + 6z³ -16)

                                  z ((z³)² + 6z³ -16)             express z⁶ as a power

                                  z (z³ + 8)(z³ -2)                factor

   Now, equal to zero each term

    z1 = 0           first answer

    z³ + 8 = 0         z³ = -8          z2 = -2             second answer

    z³ -2 = 0           z³ = 2            z3 = ∛2 or 1.26   third answer

When determining the roots of a function, you set the function equal to zero and solve for the variable. For example, the roots of the function f(x) = x² - 5x + 6 would be x = 2 and x = 3.

Though the specific function is not provided in the question, the general process to determine all the roots of a function lies in setting the function equal to zero and solving for the unknown variable. The roots of the function are the values of the unknown variable that make the equation true. For example, if you have a function f(x) = x² - 5x + 6, by setting it to zero and following the method you obtain the roots as x = 2 and x = 3.

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Answer:

The answer to your question is letter C.117

Step-by-step explanation:

The original expression is: uv² +5uv + u²

and u= 3 and v = 4

Then: (3)(4)² + 5(3)(4) + (3)²        Substitution

          (3)(16) + 5(12) + 9             Expanding

          48 + 50 + 9                      Simplify

          117                                    Result

The value of the algebraic expression [tex]uv^2 + 5uv + u^2[/tex] at u = 3, v = 4 is 117

Third option is correct

What is algebraic expression?

Algebraic expression consist of variables and numbers connected with addition, subtraction, multiplication and division.

For example - in 2x + 3y -7,  the numbers are 2, 3, 7, variables are x, y and operations are addition, subtraction and multiplication.

Here,

[tex]uv^2 + 5uv + u^2[/tex]

Here, u = 3, v = 4

[tex]3(4)^2 + 5(3)(4) + (3)^2\\48 + 60 + 9\\117[/tex]

Third option is correct.

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Answer:

[tex]8x^8[/tex] (Please see my interpretation of the problem.)

The problem:

Simplify [tex]\sqrt{64x^{16}}[/tex] (Please tell me if I did or didn't interpret your problem correctly. Thank you!)

Step-by-step explanation:

[tex]\sqrt{64x^{16}}[/tex]    (Given)

[tex]\sqrt{64}\sqrt{x^{16}}[/tex] (if u and v are positive then [tex]\sqrt{uv}=\sqrt{u}\sqrt{v}[/tex])

[tex]8\sqrt[2]{x^{16}}[/tex]  ([tex]\sqrt{ }=\sqrt[2]{}[/tex])

[tex]8x^{\frac{16}{2}}[/tex]  ([tex]\sqrt[n]{x^m}=x^\frac{m}{n}[/tex])

[tex]8x^8[/tex]   (simplified/reduced the fractional-exponent)

Answer:

8x8

Step-by-step explanation:

so B

Answer:

There are 49 corrupt senators and 1 honest senator.

Step-by-step explanation:

Freedonia has 50 senators. Each senator is either honest or corrupt. At least one of the Freedonian senators is honest.

As we can see that there are no two senators where both of them are honest. So either there is one senerator who is honest or none.

As given that at least one of the Freedonian senators is honest.

Hence, we can conclude there is one and only one honest senator.

Final answer:

In Freedonia's senate, there must be one honest senator and forty-nine corrupt senators to satisfy the given conditions.

Explanation:

To solve the problem presented, we must work under the conditions that in Freedonia's senate of 50 senators, which implies that there are 50 senators in total, each is either honest or corrupt, at least one senator is honest, and in any pair of senators, at least one is corrupt. This means it's impossible to have two honest senators together, as this would contradict the condition that in any pair of senators, there must be at least one corrupt senator.

Given that there is at least one honest senator, we can use logic to deduce the following: If we were to assume that there are two honest senators, we would have a pair of senators where both are honest, which violates the given condition. Therefore, there can be only one honest senator in Freedonia's senate to meet all the conditions laid out in the problem.

Since the total number of senators is 50, and we have established that there is only one honest senator, it follows that the remaining 49 senators must be corrupt. Hence, the Freedonia's senate consists of one honest senator and forty-nine corrupt senators.

Initial population size is 188 and after 9 years we get 1259 fishes.

We have given that the function

[tex]P(t)=\frac{1500}{1+7e^(-0.04t)}[/tex]

Where t is the number of years from the time the species was added to the lake.

We have to find the initial population size of the species and the population size after 9 years.

where p(0) is the population size of species and p(9) is the population size after 9 years.

Therefore we have the given function is at t=0

[tex]P(0)=\frac{1500}{1+7e^(-0.04(0)))}=\frac{1500}{1+07e^0} \\=\frac{1500}{1+7} \\=\frac{1500}{8} \\=187.5\\=188[/tex]

at t=9 we have

[tex]P(9)=\frac{1500}{1+7ex^{-0.4(9)} }\\=\frac{1500}{1+7e^{-3.6} } \\=\frac{1500}{1.191}\\ =1259.16\\=1259 fishes[/tex]

Therefore after 9 years we get 1259 fishes.

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The initial population size of the species is approximately 188. After 9 years, the population size is approximately 1260.

To find the initial population size of the species, we need to evaluate the population function ( P(t) ) at ( t = 0 ).

Given the population function:

[tex]\[ P(t) = \frac{1500}{1 + 7e^{-0.4t}} \][/tex]

1. **Initial population size (( P(0) )):**

  Substitute ( t = 0 ) into the function:

[tex]\[ P(0) = \frac{1500}{1 + 7e^{-0.4 \cdot 0}} \][/tex]

[tex]\[ P(0) = \frac{1500}{1 + 7e^0} \][/tex]

 [tex]\[ P(0) = \frac{1500}{1 + 7 \cdot 1} \][/tex]

[tex]\[ P(0) = \frac{1500}{1 + 7} \][/tex]

[tex]\[ P(0) = \frac{1500}{8} \][/tex]

[tex]\[ P(0) = 187.5 \][/tex]

  Round to the nearest whole number:

[tex]\[ P(0) \approx 188 \][/tex]

  So, the initial population size is[tex]\( \boxed{188} \).[/tex]

2. **Population size after 9 years (( P(9) )):**

  Substitute ( t = 9 ) into the function:

[tex]\[ P(9) = \frac{1500}{1 + 7e^{-0.4 \cdot 9}} \][/tex]

[tex]\[ P(9) = \frac{1500}{1 + 7e^{-3.6}} \][/tex]

  Calculate [tex]\( e^{-3.6} \):[/tex]

[tex]\[ e^{-3.6} \approx 0.02732 \][/tex]

  Substitute this value back into the equation:

[tex]\[ P(9) = \frac{1500}{1 + 7 \cdot 0.02732} \][/tex]

[tex]\[ P(9) = \frac{1500}{1 + 0.19124} \][/tex]

 [tex]\[ P(9) = \frac{1500}{1.19124} \][/tex]

[tex]\[ P(9) \approx 1260 \][/tex]

  Round to the nearest whole number:

[tex]\[ P(9) \approx \boxed{1260} \][/tex]

  So, the population size after 9 years is [tex]\( \boxed{1260} \).[/tex]

Answer:

Median.

Step-by-step explanation:

We have been given that in​ 2004, the mean net worth of families in a certain region was ​$470.2 thousand and the median net worth was ​$92.3 thousand.

We know that mean and median of a symmetric data set is equal.

We also know that when mean of a data set is greater than median, then the data set has a very large valued outlier.

Since mean net wroth of families is approximately 5 times more than median net wroth of families, this means that some of the families has very high net worth as outliers.

Since the net worth of families has very large outliers, therefore, I would prefer median as the appropriate measure of center as median is not affected by outliers.

Answer:

The answer to your question is: the last option 3.0 x 10⁻¹⁰

Step-by-step explanation:

First divide 3.3 by 1.1

                                     3.3 / 1.1 = 3

Then subtract -8 - (2) = -8 -2 = -10

Finally use scientific notation where the power will be -10

            result :                3 x 10 ⁻¹⁰

Answer:

The another term for the 4% value is : Margin of error

Step-by-step explanation:

Dr. Cyril conducts a simple random sample of 500 men.

He finds that 23% of them report being unsure of their ability to be good fathers, plus or minus 4%.

Now, the another term for the 4% value is : Margin of error

Means the estimate of father being unsure about his ability would be between 19% and 27%.

When sample size is increased, the margin of error becomes smaller.

Answer:

Step-by-step explanation:

15 people can be served because a liter equals to 1000 milliliters and that means that 7 times two equals 14 plus the other 500 milliliters then that's 15.

15 people can get water before the cooler is empty.

In order to find the number of people who would be able to get water before the cooler empties, you need to divide the total quantity of water in the cooler by the quantity given to each person.

To do that, both quantities have to have the same unit. The liters should therefore be converted to milliliters.

1 liter = 1,000 milliliters

7.5 liters = 7.5 x 1,000

= 7,500 milliliters

The number of people that would get a drink is:

= Quantity of water in cooler / quantity of water per person

= 7,500 / 500

= 15 people

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