1. In​ 2012, the population of a city was 5.63 million. The exponential growth rate was 1.45​% per year.
​a) Find the exponential growth function.
​b) Estimate the population of the city in 2018.
​c) When will the population of the city be 10 ​million?
​d) Find the doubling time.

1. In 2012, The Population Of A City Was 5.63 Million. The Exponential Growth Rate Was 1.45% Per Year.a)

Answers

Answer 1

The exponential function is P = 5.63(1.0145)ⁿ. And the population of the city in 2018 is 6.1379 million, the number of the years when the population of the city is 10 million is 40 years, and the doubling time will be 49 years.

What is an exponent?

The exponent denotes that the base will rise to a specific level of strength. The base is X, and the power is n.

In​ 2012, the population of a city was 5.63 million. The exponential growth rate was 1.45​% per year.

Then the exponential function will be given as

P = 5.63 (1.0145)ⁿ

Where P is the population (in million) and n is the number of years.

Then the population of the city in 2018 will be

n = 2018 - 2012 = 6

Then we have

P = 5.63 (1.0145)⁶

P = 5.63 x 1.0902

P = 6.1379 million

The number of the years when the population of the city is 10 million.

    10 = 5.63 x (1.0145)ⁿ

1.776 = (1.0145)ⁿ

Taking log both sides, then we have

log 1.776 = n x log 1.0145

            n = 39.90

            n ≅ 40 years

Then the doubling time will be

2 = (1.0145)ⁿ

Taking log on both sides, then we have

log 2 = n x log1.0145

      n = 48.1489

      n ≅ 49 years

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Related Questions

What are the center and radius of the circle with equation x^2 + y^2 - 4x - 6y + 8 = 0?​

Answers

Answer:

centre : (2;3)

radius :

[tex] \sqrt{5} [/tex]

what is the value of the expression 1 cubed, 2 cubed, and 3 cubed

Answers

1³ + 2³ + 3³

1 + 8 + 27

36

hope it helps..!!!

Are the ratios 8:3 and 4:1 equivalent?

Answers

no

8/3 = 2.7

4/1 = 4

2.7 ≠ 4

Answer:

No.

Step-by-step explanation:

8:3 = 8/3

4:1 = 4/1 = 8/2

8/2 is not = 8/3

Reuben has bought 30 pounds of dog food. He feeds his dog 3/5 pounds for each meal. For how many meals will the food last?

Answers

Answer:

50

Step-by-step explanation:

3*50=150. 150/5=30 pounds

pls help me classify this

Answers

First image -Pentagon(Five sides).

Second image-Equilateral triangle(All sides are equal).

Norman gave 1/3 of his money to his wife. He divided the remainder equally between his 3 children. What fraction of his money did each of his children receive?​

Answers

22% each to 22/100

Methamatics

1. what is the product of 3.62 and 9.8?

2. Express 5/6 as a percentage

3. find 500,000 less than 1031001 ?

4. Express 75% as a fraction in the lowest term .

5. Express 2.50 as a percentage

6. simplify 18 + 0.8 - 1.293

7. find the cost of a shirt with a price tag of £29•00

8. Anna was given £50.00.she bought a mathematical set for £15.50 and an exercise book £2.30.how much change will she receive .

Answers

Answer:

1. 35.476

2. 83.33%

3. 531001

4. 3/4

5. 250%

6. 17.507

7. £29•00

8. 32

Step-by-step explanation:

math is done on calculator :)

Find the area of the triangle. MY GRADE PLEASE HELP!

Answers

Answer:

B:21

Step-by-step explanation:

Area of parallelogram=315=base ×hight .

base =x

hight= 15

15 × x = 315

x= 315/15

=21

Answer answer questions please

Answers

Answer: 2 1/4

Step-by-step explanation: theirs 2 whole so with that theirs another circle cut in 4th's and 1 is shaded so 1/4.

Answer: choice c , 2 and 1 over 4

Step-by-step explanation: as the first 2 circles are fully shared but only one 1 over 4 from the third circle is shaded so 2 and 1 over 4 as a mixed numbers . Which means 2 full circles and 1 over 4 of the third circle . HOPE IT HELPS YOU .PLEASE GIVE BRAINLIEST .THANKS .

PLSSS HELP IF YOU TURLY KNOW THISS

Answers

Answer:

La respuesta es A

Step-by-step explanation:

simplemente tienes que multiplicar 7 x 3 que te da 21 y luego tienes que sumar el 2 del numerador (siempre multiplica el o los enteros por el denominador y sumale el numerador)

Answer:

A

Step-by-step explanation:

The larger number in a mixed number represents how many "wholes" of the fraction there are. The fraction in a mixed number is sort of like the "leftovers", the amount that doesn't fit into a whole number. In this case, the whole number is 7, meaning there are 7 amounts of 3/3. You would multiply the whole number by the number in the denominator of the fraction, which would equal 21. The improper fraction of the whole number would be 21/3 (21 divided by 3 equals 7). Now you would add that to the fraction 2/3. The answer would be 23/3.

I hope this makes some type of sense, I didn't explain it very well.

Please help me geometry proof for trapezoid

Answers

A trapezoid is a quadrilateral that has two parallel sides with a height.

The proof for trapezoid

From the diagram, AK = 1/2(AD-BC)

The combination of the bases of the equilateral triangle and the parallelogram is = the base of the trapezoid.

Therefore, BC = AD - 2AK

Make AK the subject of formula,

AK= 1/2 (AD -BC)

From the second equation given,

KD = 1/2(AD - BC). This is wrong because of the following,

BC is parallel to KD.

Therefore length of KD = BC - AK and not KD = 1/2(AD - BC).

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I was absent the entire time my teacher taught this lesson, please help me

Answers

Answer:

1 - 4/9

2 - 1/9

3 - 5/9

Step-by-step explanation:

1 - Look on the left side for all two-letter combinations with only one R. We can see four. (YR, GR, RG, RY). Divide by the total number of outcomes (9).

2 - There is only one with two yellows, so divide 1 by 9.

3 - Same as before, we find 4 with 1 green and 1 with 2 green. We have to include the new one since it says atleast one. Add 1 and 4 and then divide by 9.

Find areas of the triangles.

Answers

Answer:

2.75

Explain
1 3/5 = 8/5
3 7/16 = 55/16

8/5 x 55/ 16 = 440/80
440/80 : 2 = 5.5

5.5 / 2 = 2.75
Simple as that
You can check the calculator

Answer:

2.72

Step-by-step explanation:

1 3/5 is 1.6 and 3 7/16 is 3.4 so 1.6 x 3.4=5.44 and 5.44/2 is 2.72 sq u

need help asap, thanks!!!ヾ(⌐■_■)ノ♪

Answers

Step-by-step explanation:

the probability of making one shot is 75% or 0.75 or 3/4.

the probability to make 2 shots is then

3/4 × 3/4 = 9/16 = 0.5625

and so on.

the probability to miss 1 shot is then 25% or 0.25 or 1/4.

the probability to make at least 4 out of 5 shots is the sum of the probability to make all 5 shots plus the probability to make 4 shots.

or the probability to miss 0 plus the probability to miss 1 shot.

anyway, we can go with the positive approach. it seems to be the same complexity as the negative approach.

the probability to make all 5 shots is

(3/4)⁵ = 3⁵/4⁵ = 243 / 1024 = 0.237304688...

the probability to e.g make the first 4 shots and miss the 5th is

(3/4)⁴×1/4 = 3⁴/4⁵ = 81 / 1024 = 0.079101563...

how many possibilities do we have to make 4 out of 5 shots ?

there is no repetition, and the sequence inside the "picked" 4 does not matter, so we need combinations :

C(5,4) = 5! / (4! × (5-4)!) = 5

so, the probability to make exactly 4 out 5 shots is

81/1024 × 5 = 405/1024 = 0.395507813...

and the total probability to make at least 4 shots is

243/1024 + 405/1024 = 648/1024 = 81/128 = 0.6328125

to control,

this plus making exactly 3 plus exactly 2 plus exactly 1 plus none must be the probability 1 (as there is no other possible outcome).

making 3 :

(3/4)³×(1/4)² = 3³/4⁵ = 27/1024

C(5,3) = 5×2 = 10

270/1024

making 2 :

3²/4⁵ = 9/1024

C(5,2) = 5×2 = 10

90/1024

making 1 :

3/1024

C(5,1) = 5

15/1024

making 0 :

1/1024

in sum

(270+90+15+1)/1024 = 376/1024

plus the 648/1024 = 1024/1024 = 1

correct.

what is 9 + 10 (The fiwrst persen to andswer getin brainliest

Answers

Answer:

it's 19

Step-by-step explanation:

the answer it's 19

How is perimeter helpful in daily life?

Answers

Answer:

so you can know how long an objects size on the outside

100pts Find mPQ in the circle to the right

Answers

We need indirectly m<POQ

See NR is a straight line so the three angles situated underneath are linear pair and supplementary

m<POQ

180-(82+63)180-14535°

Answer:

C)  35°

Step-by-step explanation:

From inspection of the given diagram, it appears that the line segment NOR is the diameter of the circle (where point O is the center).

Angles on a straight line sum to 180°

⇒ ∠NOP + ∠POQ + ∠QOR = 180°

⇒ 82° + ∠POQ + 63° = 180°

⇒ ∠POQ = 180° - 82° - 63°

⇒ ∠POQ = 35°

As an arc measure equals its corresponding central angle measure:

[tex]\sf \implies \overset{\frown}{PQ}= \angle POQ[/tex]

[tex]\sf \implies \overset{\frown}{PQ}=35^{\circ}[/tex]

1. Suppose a married man and woman both carry the gene for cystic fibrosis but don't
have the disease themselves. According to the laws of genetics, the probability that
any child they have will develop cystic fibrosis is .25.
a) Explain what this probability means.

b) If the couple has 4 children, is one of them guaranteed to have cystic fibrosis.

Answers

Answer:

a) Probability is the chance or possibility that an event will occur.

b) No,

just as the question states there is a 25% chance of this event happening in a child, so no matter the number of children they have the chances of them getting cystic fibrosis is 25% for each child and it's never guaranteed.

What is the 43rd term of a Arithmetic sequence 3, 5, 7

Answers

Answer:

87

Step-by-step explanation:

common difference = d  = 2

an = a1 + (n-1)*d

a43 = 3 + 42*2  = 87

I need help, I have a test tomorrow and I didn't understand this exercise

Answers

Answer:

Step-by-step explanation:

Circumference = 2(pi)r

Radius = Circumference/2(pi)

Circumference = 37.68

Radius = 37.68/2(pi)

Radius = about 59.18760559

Find the mean of the following data: 4, 5, 6, 6, 7, 9, 12.

Answers

Answer:

Mean=7

Step-by-step explanation:

Mean = Sum of numbers    = 4 + 5 + 6 + 6 + 7 + 9 + 12  = 49  =  7

           Amount of numbers                    7                            7

Let f(x) = -x -5 and g(x)= 2x +3. f(-4) + g(-6)​

Answers

Answer:

-10

Step-by-step explanation:

f(-4)=-(-4)-5

f(-4)=-1

g(-6)=2(-6)+3

-12+3

g(-6)=-9

add together:

-1+-9

=-10


A colony of 10,710 bacteria doubles in size every 129 minutes. What will the population b
516 minutes from now?

Answers

The population after 516 minutes is 171360 bacteria

How to determine the population after 516 minutes

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

Initial, a = 10,710 bacteria

Rate = doubles i.e. 2

Using the above as a guide, we have the following:

f(x) = a(2)^x

Where x is the time

516 minutes is 4 times 129 minutes

This means that

x = 516/129 = 4

So the population after 516 minutes can be calculated as follows:

f(4) = 10710 * (2)^4

Evaluate

f(4) = 171360

Hence, the population is 171360

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The volume of a sphere is V=4/3 pie r 3
where r is the radius of the
sphere. Determine the volume of the sphere where the radius is
measured at 6 inches.
a 288pie 3
b 216 pie 3
C 144 pie 3
d 48 pie 3

Answers

Answer:

A. 288pi in^3

Step-by-step explanation:

s

ee image

(20 points) Enter the y coordinate of the solution to this system of equations.

6x + y = 8
x − 2y = 10

Answers

Answer:

y=-4

Step-by-step explanation:

graph each equation or solve by elimination/subtitution. Easiest way is using Desmos graphing calculator

Y=-4 this is because when you are looking at these two equations you can either solve by elimination or substitution.

Reggie has $240 in a savings account at the beginning of the summer. He wants to have at least $450 in the account by the end of the summer. He deposits $35 each week. What is the shortest amount of time Reggie needs to deposit money into his account?

Answers

Answer:

6 weeks

Step-by-step explanation:

Since Reggie has $240 in the account already we first subtract this $240 from the $450. 450 - 240 = 210. Now since he deposits $35 a week and needs to hit at least 210 to reach is goal of $450 for the summer then we need to divide 210/35 to see the amount of weeks.  210/35 = 6. So 6 weeks  is the shortest time.

6 weeks. 35x6=210. 240+210=450

Find the y-intercept of the line 11x - 8y = -1.
write your answer as an integer or as a simplified proper or improper fraction, not as an
ordered pair.
submit

Answers

Answer:

1/8

Step-by-step explanation:

I'd start by rearranging the terms for y:

11x-8y=-1

-8y=-1-11x

y=[tex]\frac{-1-11x}{-8}[/tex]

The x-intercept is found when x equals 0, so substitute 0 for x in this new equation to find the y-intercept:

[tex]y=\frac{-1-11x}{-8} \\y=\frac{-1-11(0)}{-8}\\ y=\frac{-1-0}{-8} \\y=\frac{-1}{-8}\\ y=\frac{1}{8}[/tex]

The y-intercept is 1/8

A triangle has a scale factor of 3. one of the coordinates is (9,6), what would another coordinate be?

Answers

Answer:

(12, 9)

Step-by-step explanation:

I need this asap

13 points (SHOW WORK)

Answers

Answer: 23

6*6=36 total area

3*3=9

2*2=4

9+4=13

36-13=23 shaded area

need help with all of these questions you see on the top. there the red squares. please someone smart. this is one of the problems I need to finish this tonight. ( Both Parts )​

Answers

Answer:

433.5 cm^3

Step-by-step explanation:

The volume of a cylinder is its base area times height. Therefore it can be said that:

V = 23π x 6

This is 433.539786195, which when rounded to the nearest tenth is 433.5.

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