A population of bacteria doubles every 3 hours. If there are initially 500 bacteria, how many will there be after 9 hours?
Real-World Word Problems: Growth & Decay Challenges

Quiz
•
English, Mathematics
•
8th Grade
•
Hard
Anthony Clark
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
2000
4000
3000
1000
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A car's value decreases by 15% each year. If the car is worth $20,000 now, what will its value be after 2 years?
$14,450
$12,000
$16,000
$18,000
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A tree grows at a rate of 5% per year. If it is currently 10 feet tall, how tall will it be in 4 years?
8 feet
12.16 feet
10 feet
15 feet
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A savings account earns 4% interest compounded annually. If you deposit $1,000, how much will you have in the account after 5 years?
1216.65
1500.00
1100.00
1000.00
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A radioactive substance decays at a rate of 10% per hour. If you start with 200 grams, how much will remain after 3 hours?
100 grams
220 grams
180 grams
145.8 grams
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A population of rabbits increases by 25% each month. If there are 80 rabbits now, how many will there be in 3 months?
100
200
156
120
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A certain species of fish decreases in population by 20% each year. If there are currently 1,000 fish, how many will be left after 2 years?
640
720
800
500
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