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Exponential Growth and Decay Word Problems Practice

Authored by Anthony Clark

Mathematics

9th Grade

CCSS covered

Used 1+ times

Exponential Growth and Decay Word Problems Practice
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20 questions

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1.

MULTIPLE SELECT QUESTION

1 min • 1 pt

North Dakota has recently had the fastest growing population out of all 50 states. On Jan 1, 2013, the population of North Dakota was 700,000 people. North Dakota’s population has been growing by 5% per year. Express North Dakota’s population, N, in terms of years since 2013, t. Check the BEST answer:

N=700,000(1.05)t

N=700,000(1.5)t

N=700,000(1-0.05)t

N=700,000(0.95)t

Tags

CCSS.HSF.LE.A.2

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

An air freshener starts with 30 grams of fluid, and the amount of fluid decreases by 12% per day. Express the amount of grams of freshener, Q, that remains, t, days after it has begun being used. Check the BEST answer: (HINT: that means simplify what is in the parenthesis)

Q=30(1+0.12)t

Q=30(1-0.12)t

Q=30(0.88)t

Q=12(1.30)t

Tags

CCSS.HSF.LE.A.2

3.

FILL IN THE BLANK QUESTION

1 min • 1 pt

What is the initial quantity?

4.

FILL IN THE BLANK QUESTION

1 min • 1 pt

From 2000 - 2010 a city had a 2.5% annual decrease in population. If the city had 2,950,000 people in 2000, determine the city’s population in 2008.

Round to the nearest..... (these are people)... so whole number!

Tags

CCSS.HSF-LE.A.1C

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Using the exponential function equation f(x)=ab^x, where a is the starting value and b is the growth or decay, and x is the time, find the population of bacteria after 5 hours if it doubles every hour and initially has 100 bacteria.

500

3200

2000

1000

Tags

CCSS.HSF-IF.C.8B

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Using the exponential function equation f(x)=ab^x, where a is the starting value and b is the growth or decay, and x is the time, find the population of fish after 8 weeks if the population doubles every week and initially there are 1000 fish.

128000

512000

64000

256000

Tags

CCSS.HSF-LE.A.1A

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Using the exponential function equation f(x)=ab^x, where a is the starting value and b is the growth or decay, and x is the time, find the population of rabbits after 6 months if the population triples every month and initially there are 50 rabbits.

50000

145800

3000

800

Tags

CCSS.HSF-IF.C.8B

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