explain the process of the square root of 80n3

Answers

Answer 1

The square root of 80 is 4√5 ≅ 8.92.

What is a square root of a number?

In mathematics, the square root of a number is a value that gives the original number on multiplication by itself. The positive number, when multiplied by itself, represents the square of the number. Thus, the square root of the square of a positive number gives the original number.

Using Prime Factorization:

The first step in this method is to find the prime factors of 80.

80 = 2 × 2 × 2 × 2 × 5

To find the root from here, we can simplify this to

√80 = √(2 × 2 × 2 × 2 × 5)

√80 = 4√5

We can either leave it at this or find the root of 5 which is 2.23 and simplify further.

Hence, Square Root of 80 = 4√5 ≅ 8.92.

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Related Questions

Consider the following primal problem:
Maximize
subject to:


z=7x
1

−5x
2

−2x
3


x
1

−x
2

+x
3

=10
2x
1

+x
2

+3x
3

≤16
3x
1

−x
2

−2x
3

≥−5
x
1

≥0,x
2

≤0,x
3

unrestricted in sign

Write down the dual problem of the above primal problem.

Answers

The first constraint is a linear equation that relates the variables x1, x2, and x3, and the second constraint is an inequality constraint involving x1 and x2The given problem is a linear programming problem in its primal form.

The objective is to maximize the expression z = 7x1 - 5x2 - 2x3, subject to two constraints.. The goal is to find the values of x1, x2, and x3 that maximize the objective function while satisfying the given constraints.

In the primal problem, the objective is to maximize the expression z, which is a linear combination of the decision variables x1, x2, and x3. The coefficients 7, -5, and -2 represent the weights assigned to each variable in the objective function. The constraints represent the relationships and limitations imposed on the variables. The first constraint is an equality constraint, which means that the left-hand side of the equation must equal the right-hand side. The second constraint is an inequality constraint, indicating that the value of the expression 2x1 + x2 must be less than or equal to a certain value.

To solve this linear programming problem, various optimization techniques such as the simplex method or interior point methods can be applied. These methods iteratively adjust the values of the decision variables to find the optimal solution that maximizes the objective function while satisfying the given constraints. By solving the primal problem, the values of x1, x2, and x3 can be determined, leading to the maximum value of the objective function z.

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Can any one do B and B please help me I need help me please thank you

Can any one do B and B please help me I need help me please thank you

Answers

Answer:

see below

Step-by-step explanation:

1 B    Answer :

\(7\times7\times7\times7\times7/7\times7\times7\times7=7\)    or    \(7^{2+3}/7^{4} =7^{5-4} =7^{1} =7\)

2 B    Answer :

\(k^{4\times2} \times k^{5} =k^{8+5} =k^{13}\)

3B    Answer :

\(5a-15-a/1=5a-a-15=4a-15\)

Hope that help

mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 33 marbles into a marble jar. when the jar has 100 100100 or more marbles, the students have a party. right now, the jar has 24 2424 marbles. will the students have a party if mrs. morton rewards them 31 3131 additional times?

Answers

No, the students will not have a party if Mrs. Morton rewards them 31 additional times.  Currently, the marble jar has 24 marbles. Each time Mrs. Morton rewards the students for good behavior, she adds 33 marbles to the jar.

So, if she rewards them 31 more times, the total number of marbles added to the jar would be 31 * 33 = 1023 marbles. Adding this to the initial 24 marbles, the total number of marbles in the jar would be 24 + 1023 = 1047 marbles. Since the condition for having a party is to have 100 or more marbles in the jar, the students would indeed have a party because 1047 is greater than 100.

However, there seems to be a discrepancy in the question. It states that the marble jar currently has 24 marbles, but the condition for having a party is to have 100 or more marbles. Therefore, based on the information given, the students should already be eligible for a party since they have 24 marbles, which is greater than 100. Adding 31 more sets of 33 marbles would only increase the number of marbles in the jar further. Hence, No, the students will not have a party if Mrs. Morton rewards them 31 additional times.

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Amanda increased the amount of water she drinks every day from 32 ounces to 96 ounces. By what percent did Amanda increase the amount of water she drinks?


A. 200%


B. 33. 3%


C. 300%


D. 16. 7%

Answers

To calculate the percentage increase, we need to find the difference between the initial amount and the increase, and then express that difference as a percentage of the initial amount.

In this case, the initial amount of water Amanda drank was 32 ounces, and the increase was 96 - 32 = 64 ounces.

To express this increase as a percentage of the initial amount, we divide the increase (64 ounces) by the initial amount (32 ounces) and multiply by 100 to get the percentage:

Percentage increase = (increase / initial amount) * 100

= (64 / 32) * 100

= 200%

Therefore, Amanda increased the amount of water she drinks by 200%. This means that she now drinks twice the amount she used to drink, as the increase represents twice the initial amount.

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How many pounds of water must be evaporated from 50 pounds of a 3% salt solution so that the the remaining solution will be 5 % salt

Answers

Answer:

Step-by-step explanation:

This is kinda tricky, but not nearly as bad as d = rt problems. Those are a nightmare!

We will make a table for this:

                         #lbs solution           *          % salt         =           lbs. salt

  3% solution

-  Water                                                                                                      

New solution

And we will now fill in what we know. The 3% solution part is easy. The number of pounds of that is 50 and the percent salt in 3% salt is....well, 3%. As a decimal, it is .03:

                             #lbs solution        *        %salt        =        lbs salt

  3% solution                50                 *          .03         =           1.5

-  Water                                                                                                

New solution

The last column there with a 1.5 in it is the product of 50 times .03, since that is what the formula at the top of the table tells us we have to use. Now for the water. That's easy, too, since the amount of water we are evaporating (notice the subtraction sign out front of the word "water"; that indicates we are removing water) is our unknown, and we also know that water has 0% salt in it:

                          #lbs solution         *       %salt        =        lbs. salt

   3% solution            50                  *         .03         =           1.5

-   Water                       x                  *            0          =            0        

New solution

Now all we have left is the new solution row and the equation. Finding the equation from a mixture table is as easy as it can be! Super easy!

The new solution will be 50 - x since, going down column 1, we are subtracting the water from the 3% solution, the % salt is to be 5%:

                            #lbs. solution        *       %salt        =        lbs. salt

   3% solution               50                *         .03          =           1.5

-   Water                          x                 *           0           =            0        

New solution         50 - x                  *         .05          =     2.5 - .05x

Now we're ready for our equation. I got the 2.5 - .05x from multiplying

.05(50 - x), just so you know.

if we had to subtract the water from the salt solution and set it equal to the new solution in the first column, we also have to do it in the third column:

1.5 - 0 = 2.5 - .05x and solve for x:

-1 = -.05x so

x = 20 pounds of water

What is the solution of this linear equation see photo

What is the solution of this linear equation see photo

Answers

SOLUTIION

The given equations are

\(p+q+r=32,p-r=4,2p+q=36\)

This further gives

Therefore the solutions are:

\(p=\frac{-q+36}{2},r=\frac{36-q}{2}-4\)

From the option considering the value q=8, it follows

\(\begin{gathered} p=\frac{-8+36}{2} \\ p=14 \end{gathered}\)

And

\(\begin{gathered} r=\frac{36-8}{2}-4 \\ r=14-4 \\ r=10 \end{gathered}\)

Therefore the solution is

\((14,8,10)\)

What is the solution of this linear equation see photo
What is the solution of this linear equation see photo

A tile is selected from seven tiles, each labeled with a different letter from the first seven letters of the alphabet.

A tile is selected from seven tiles, each labeled with a different letter from the first seven letters

Answers

A) The outcome for Event X or Y is expressed as; X ∪ Y = {D, A, B, E}

B) The outcome of Event X and Y is; X ∩ Y = {A, B, E}

How to use the sets notation?

We are given the events;

Event X; The letter selected is found in the word "BEAD"

Event Y; The letter selected comes after D

Thus;

A) The outcome for Event X or Y is expressed as;

X ∪ Y = {D, A, B, E}

B) The outcome of Event X and Y is;

X ∩ Y = {A, B, E}

C) Complement of Event Y is;

Y^(c) = {D}

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use the definition of the laplace transform to find l{f(t)} where f(t) = ! t 1 if 0 ≤ t < 1 0 if 1 ≤ t

Answers

Using the definition of the Laplace transform, we can find the Laplace transform of f(t) = { t, 0 ≤ t < 1; 0, 1 ≤ t } as follows:

L{f(t)} = ∫[0,∞] t e^(-st) dt = 1/s^2 - e^(-s)/s, Re(s) > 0.

The Laplace transform of a function f(t) is given by the integral of f(t) multiplied by e^(-st), where s is a complex variable. In this case, we have a piecewise function f(t) defined as t for 0 ≤ t < 1 and 0 for t ≥ 1.

To find the Laplace transform, we split the integral into two parts corresponding to the two intervals of t. For the interval 0 ≤ t < 1, we integrate t e^(-st) with respect to t, resulting in 1/s^2. For the interval t ≥ 1, the function is 0, so the integral evaluates to 0.

Combining the two results, we obtain the Laplace transform of f(t) as L{f(t)} = 1/s^2 - e^(-s)/s, where Re(s) > 0.

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Please help me- thank you

Please help me- thank you

Answers

Answer:

a) The profit will be: \(Profit=y^2-99500\)

b) Since the profit is -9500 (negative) so, company will not gain any profit if they produce 300 bicycles.

Step-by-step explanation:

Cost of Bicycles= \(y^2+10y+100,000\)

Revenue generated = \(2y^2+10y+500\)

Find a polynomial that represent profits

The formula used for finding profit is:

\(Profit = Total \ Revenue - Total \ Cost\\Profit= 2y^2+10y+500 - (y^2+10y+100,000)\\Profit= 2y^2+10y+500 - y^2-10y-100,000\\Profit=2y^2-y^2+10y-10y+500-100,000\\Profit=y^2-99500\)

So, the profit will be: \(Profit=y^2-99500\)

If the company can produce bicycles y= 300

The profit will be:

\(Profit=y^2-99500\\Profit=(300)^2-99500\\Profit=90000-99500\\Profit=-9500\)

Since the profit is -9500 (negative) so, company will not gain any profit if they produce 300 bicycles.

Rochelle wants to determine the favorite food among her family members at a reunion.

Which sampling method would most likely provide a representative sample of the family members?

A.Divide the female family members at the reunion into age groups of equal size, and survey four female family members chosen randomly from each age group.

B.Divide all the family members at the reunion into age groups of equal size, and survey three family members were chosen randomly from each age group.

C. Survey all the family members at the reunion who are under 10 years old.

D.Survey all the family members at the reunion who are over 60 years old.

Answers

You look like dababy no
Rochelle wants to determine the favorite food among her family members at a reunion.Which sampling method

In this question we will solve a simplified version of the Grossman model. Suppose utility is U(H
t

,Z
t

)=Z
t

×H
t

. The production function for health is H
t

= M
t

+H
t−1

and production for the home good is Z
t

=J
t

(Hint: Notice these are not functions of T
H
or T
Z
). The price of M
t

is 2$ per unit and the price of J
t

is 1$ per unit. The individual works a fixed amount of time, T
W
=5 at wage w=2$ per unit of time (Hint: we are assuming T
W
is fixed and not a choice). Previous periods health, H
t−1

=1. There is no time constraint in this example. For the remaining, we focus on a single period and assume the future does not impact decisions today. 1. What is the budget constraint in this period? 2. Now we will solve for the optimal allocation of health and the home good. Steps; (a) Calculate the first order conditions of the utility function and set them equal to zero. (b) Combine this with the budget constraint and solve for the optimal level of H and Z. 3. Now suppose health depreciates at rate γ=0.75. How may we incorporate this into our model? Solve the new optimal choice of H
t

and Z
t

, and provide and explain the intuition for why the changes occurs.

Answers

1. The budget constraint in this period is given by 2H + Z = 10.

2. The optimal allocation of health (H) and the home good (Z₁) is H = (5/3)w and Z₁ = (5/3)w, respectively.

3. Incorporating health depreciation at a rate of 0.75, the new optimal choice is H = 6.25 and Z₁ = (5/3)w.

4. When the individual becomes twice as efficient at producing health with Me, the new optimal choices are H = 6.25 + 2Me and Z₁ = (5/3)w.

5. When the wage rises to $3 per unit time, the optimal choices of H₂ and Z remain the same as in the previous case (H = 6.25 + 2Me and Z₁ = (5/3)w) as there is no impact on the relative prices and production functions.

The budget constraint in this period can be defined as 2H + Z = 5w. Since the individual works a fixed amount of time, TW = 5, and the wage is $2 per unit of time, the total income available for the individual is 5w.

To find the optimal allocation of health (H) and the home good (Z), we need to calculate the first-order conditions of the utility function and set them equal to each other.

∂U/∂H = Z₁ = λ

∂U/∂Z = H = λ

Setting these equal to each other, we get:

Z₁ = H

Combining this with the budget constraint:

2H + Z = 5w

Substituting Z₁ = H into the budget constraint, we have:

2H + H = 5w

3H = 5w

H = (5/3)w

Substituting H back into Z₁ = H, we get:

Z₁ = (5/3)w

Therefore, the optimal level of health (H) is (5/3) times the wage (w), and the optimal level of the home good (Z₁) is also (5/3) times the wage (w).

To incorporate health depreciation at a rate of y = 0.75, we need to modify the production function for health. The new production function becomes:

H₁ = (1 - y)H₋₁ + Mt

Substituting the given values, H₋₁ = 1 and TW = 5, we have:

H₁ = (1 - 0.75) + 5

H₁ = 1.25 + 5

H₁ = 6.25

Therefore, the new optimal level of health (H) is 6.25, and the optimal level of the home good (Z₁) remains the same as before, which is (5/3) times the wage (w).

The intuition behind the change is that since health depreciates, the individual needs to allocate more resources towards producing health to maintain the same level of utility. As a result, the optimal level of health increases.

If the individual becomes twice as efficient at producing health with Me (while keeping the depreciation rate), the new production function for health becomes:

H₁ = (1 - y)H₋₁ + 2Me + Mt

Substituting the given values, H₋₁ = 1 and TW = 5, we have:

H₁ = (1 - 0.75) + 2Me + 5

H₁ = 1.25 + 2Me + 5

H₁ = 6.25 + 2Me

Therefore, the new optimal level of health (H) is 6.25 + 2Me, and the optimal level of the home good (Z₁) remains the same as before, which is (5/3) times the wage (w).

The intuition behind the change is that the increased efficiency in producing health with Me allows the individual to produce more health with the same amount of resources. As a result, the optimal level of health increases further.

If the wage (w) rises to $3 per unit of time, the new budget constraint becomes:

2H + Z = 5w

2H + Z = 5(3)

2H + Z = 15

To find the new optimal allocation of health and the home good, we need to solve for H and Z using the updated budget constraint. However, since the production functions for health and the home good remain unchanged, the optimal level of health (H) and the optimal level of the home good (Z₁) will still be the same as in the previous cases.

The intuition behind this is that when the wage increases, the individual's income increases, allowing them to afford more of both health and the home good. However, the optimal allocation of resources between health and the home good remains unchanged because the relative prices of Me and J, as well as the production functions, are not affected by the increase in the wage.

The complete question:

In this question we will solve a simplified version of the Grossman model. Suppose utility is U (Ht, Zt) = Z₁ × Ht. The production function for health is H₁ = Mt + Ht-1 and production for the hom.................t (Hint: Notice these are not functions of TH or T2). Th........me constraint in this example. For the remaining, we focus on a single ...ssume the future does not impact decisions today.

1. What is the budget constraint in this period?

2. Now we will solve for the optimal allocation of health and the home good. Steps;

(a) Calculate the first order conditions of the utility function and set them equal toeach other.

(b) Combine this with the budget constraint and solve for the optimal level of H andZ.

3. Now suppose health depr......n the intuition for why the changes occurs.

4. In we learne......e version of the model from

3. and explain happens to o.......he model and multiply Me by 2 in the production function.) Explain the intuition for why the changes occurs.

5. We know that education ......odel from 4.)

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In this question we will solve a simplified version of the Grossman model. Suppose utility is U(H t ,Z

solve this problem using analytical one-term approximation method (not the heisler charts). can this problem be solved using lumped system analysis? justify your answer.

Answers

This problem can be solved using the analytical one-term approximation method, but without specific details of the problem, it is not possible to provide a solution here.

As for whether this problem can be solved using lumped system analysis, it depends on the conditions of the problem. If the Biot number (Bi) is much smaller than 1 (Bi << 1), then lumped system analysis can be applied.

Otherwise, it might not be accurate to use the lumped system analysis, and you should rely on the analytical one-term approximation method or other numerical methods.

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Which graph represents f of x equals square root of the quantity x plus 3 end quantity minus 2?

The graph shows a curve with an end point at 2 comma 3 that increasing to the right
The graph shows a curve with an end point at 3 comma 2 that increasing to the right
The graph shows a curve with an end point at negative 3 comma negative 2 that increasing to the right
The graph shows a curve with an end point at negative 2 comma negative 3 that increasing to the right

Answers

The obtained graph is having is passes though the point (0,3.74 )on y-axis and (123,0) on the x-axis. None of the option is correct.

What exactly is a function?

A function is a statement, rule, or law that specifies the connection between two variables. Functions are common in mathematics and are required for the formulation of physical connections.

The given equation of the function is;

\(y = -(x+2)^{1/3}+5\)

Hence,the obtained graph is having is passes though the point (0,3.74 )on y-axis and (123,0) on the x-axis.

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Which graph represents f of x equals square root of the quantity x plus 3 end quantity minus 2? The graph

Answer:

The function f(x) = sqrt(x - 2) + 3 represents a square root function that is shifted 2 units to the right and 3 units up from the parent function f(x) = sqrt(x).

The endpoint of the function occurs when the radicand (x - 2) is equal to zero, which means x = 2. So, the function has an endpoint at (2, 3).

Since the function involves a square root, the value of y cannot be negative. Therefore, the function is increasing to the right.

The correct graph that represents the function f(x) = sqrt(x - 2) + 3 is the one that shows a curve with an endpoint at (2, 3) that increases to the right.

Therefore, the answer is: The graph shows a curve with an endpoint at 2 comma 3 that increases to the right. A.

A box with measurements of 2cm*4cm*3cm can holds 1,832 blocks. How many blocks can fit in a cylinder with a height of 11 cm and a radius of 5 cm

Answers

Blocks that can be accommodated are 66,199 blocks

Volume Blocks

The volume of the box is:

\(2cm * 4 cm * 3 cm = 24 cm^{3}\)

if this box can hold 1,832 blocks, then each block must have a volume of:

\(24 cm^3 / 1,832 = 0.0131 cm^3\)

To find out how many blocks can fit in a cylinder with a height of 11 cm and a radius of 5 cm, we need to calculate the volume of the cylinder first.

The formula for the volume of a cylinder is:

\(V = \pi r^2h\)

Where,

r is the radius

h is the height

π is a mathematical constant approximately equal to 3.14.

Substituting the given values, we get:

\(V = \pi * 5^2 * 11\)

\(V = 865.7 cm^3\)

Now, to find out how many blocks can fit in this cylinder, we need to divide the volume of the cylinder by the volume of each block:

\(865.7 cm^3 / 0.0131 cm^3\) = 66198.5 blocks (rounded to the nearest whole number)

Therefore, a cylinder with a height of 11 cm and a radius of 5 cm can hold approximately 66,199 blocks.

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how long train take to cover 162 1/2 km at an avarage speed of 40km/hr

Answers

Answer:

4 hours and 3.75 minutes

Step-by-step explanation:

\(162\frac{1}{2}\div40\\= 4.0625or4\frac{5}{80} or 4\frac{1}{16}\)

This would be 4 hours and 3.75 minutes

What is 1 + 7k + k = -7? With work provided

Answers

Answer:

k=-1

Step-by-step explanation:

Who likes math?AAAAAAAAA

Answers

Answer:is this a literal question?

Step-by-step explanation:

if so than it depends on the subject for me

PLEASE HELP - image attachment below, thanks! :)

PLEASE HELP - image attachment below, thanks! :)

Answers

32 as well according to some rule in geometry
What is the measure of R is 32 the answer

me ayudancon esto?plisssss​

me ayudancon esto?plisssss

Answers

Answer:

5/7

Step-by-step explanation:

Multiply the numerator with the numerator and the denominator with the denominator. This makes the fraction 30/42. Simplify this to get 15/21. You can simplify it again to get 5/7.

Hope this helps

Help please need the answer before 2:00

Help please need the answer before 2:00

Answers

Answer:

y = (10/7)x

Step-by-step explanation:

Ok so this is a hard question but I believe the answer is y = (10/7)x

The circumference of a circle changes from 20 to 4 after a dilation. What was the scale factor of the dilation? StartFraction 1 Over 25 EndFraction One-fifth 5 25

Answers

1/5

scale factor: 4/20 = 1/5

Answer:

B.

Step-by-step explanation:

2y-3k when y=8 and k=6

Answers

Answer:

-2

Step-by-step explanation:

2(8) - 3(6)

16 -18 = -2

Answer:

-2

Step-by-step explanation:

If y = 8, then 2y = 8 times two, so 2y = 16

If k = 6 then 3k = 6 times 3, so 3k = 18

16 - 18 = -2

Hope this helps :)

Helpppp PLEASEEE AHHHHHH

Helpppp PLEASEEE AHHHHHH

Answers

Answer:

24

Step-by-step explanation:

18+12-6

Answer:

24

Step-by-step explanation:

6+4=10

10-2=8

3*8=24

Write a fraction in which the numerator and denominator are both greater than 9. Then write the fraction in simplest form. im in 5th HELP ME

Answers

Answer:

12 = 4

15 5

Step-by-step explanation:

12 ÷3= 4

15 ÷3= 5

:)

Select the reason why these triangles are
similar. If they are not, select "Not similar."
A. AA
B. SAS
C. SSS
D. Not similar

Select the reason why these triangles aresimilar. If they are not, select "Not similar."A. AAB. SASC.

Answers

Answer is B. SAS

side angle side


Reason

the shared angle is congruent for both triangles.
the two sides are congruent because the ratio of 1:3 for both sides.

2/6 and 3/9 = 1/3 and 1/3


Also correct is AA angle angle

In two triangles, if two pairs of corresponding angles are congruent, then the triangles are similar .
A is the same for both triangles

The corresponding angles are congruent - see attached picture - so angle angle is also correct

Select the reason why these triangles aresimilar. If they are not, select "Not similar."A. AAB. SASC.

Solve the equation.
-X +8 + 3x =X-6
Ο χ= -18
Ο χ=-14
Ο Χ=2
Ο Χ=4

Answers

Answer X=-14 explanation: it’s the right one

DILLIGAF HAHAHAHAHAHAH

Answers

Answer:

does it?

Step-by-step explanation:

A researcher is investigating the effect of sleep deprivation on learning. She recruits 30 participants and randomly assigns half to a "no sleep" group and half to a "regular sleep" group. The "no sleep" group are required to stay up all night and report to a testing room at 2PM the following day. The "regular sleep" group are instructed to have a normal night's sleep and report to the testing room at 9AM the following day. Unfortunately, a water pipe broke outside the testing room window and there was noisy construction crew working the whole day of testing. Which of the following statements is true?
a. The study may be affected by a situational variable.
b. The construction noise may contribute to variability in test scores.
C. The study has a confounding variable. The groups differ in the time they are to report to the testing room.
d. All of these are true.

Answers

The study has a confounding variable since the two groups differ in the time they were supposed to report to the testing room. Since the groups differed in terms of sleep deprivation and the time they were supposed to report to the testing room, the effect of sleep deprivation on learning could not be isolated.

The statement that is true is: d. All of these are true.Explanation:A study may have various sources of variability, including participant selection, the setting in which the study is conducted, and the measure used. The following options are as follows:a. The study may be affected by a situational variable.b. The construction noise may contribute to variability in test scores.c. The study has a confounding variable. The groups differ in the time they are to report to the testing room.d. All of these are true.Therefore, all of these options are true. For example, the study may be affected by a situational variable if a natural disaster or other unforeseen event happens that causes the study to be disrupted. In this case, the study was disrupted by a noisy construction crew, which may have contributed to variability in test scores. The study has a confounding variable since the two groups differ in the time they were supposed to report to the testing room. Since the groups differed in terms of sleep deprivation and the time they were supposed to report to the testing room, the effect of sleep deprivation on learning could not be isolated.

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Help me please I don’t know the answer

Help me please I dont know the answer

Answers

Answer:

B

Step-by-step explanation:

The picture is kinda blurry for me, and I can't see the exact numbers, but with what I could see, I believe it's B

About `3. 2 x 10^{8}` people live in the United States.




About `3. 9 x 10^{7}` people live in Canada.




And about `1. 1 x 10^{8}` people live in Mexico.






About how many people live in all three countries altogether?

Answers

Answer:

About 4.69 x 10^8 people live in all three countries altogether

Step-by-step explanation:

3.9 x 10^7 is .39 x 10^8

now you can make x 10^8 into y

3.2y + .39y + 1.1y =

4.69y

make y into x 10^8 again

4.69 x 10^8

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