A population of bacteria doubles every 3 hours. If you start with 500 bacteria, how many will there be after 9 hours?
Exploring Exponential Growth & Half-Life Challenges

Quiz
•
English, Mathematics
•
8th Grade
•
Hard
Anthony Clark
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
8000
2000
4000
1000
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A certain radioactive substance has a half-life of 5 years. If you start with 80 grams, how much will remain after 15 years?
40 grams
20 grams
5 grams
10 grams
3.
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 3 years?
1100.00
1000.00
1124.86
1200.00
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A tree grows at a rate of 10% per year. If the tree is currently 2 meters tall, what will its height be after 2 years?
2.00 meters
2.80 meters
2.42 meters
2.20 meters
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A car's value decreases by 20% each year. If the car is worth $15,000 now, what will its value be in 3 years?
$7,680
$5,000
$10,000
$12,000
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A scientist has 200 grams of a substance that decays at a rate of 25% per hour. How much will remain after 4 hours?
63.28125 grams
50 grams
150 grams
100 grams
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A bank offers a compound interest rate of 5% per year. If you invest $2,000, how much will you have after 5 years?
$2,500.00
$2,000.00
$3,000.00
$2,552.56
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