Grade 7 Exponential Expressions: Word Problems Challenge

A tree doubles its height every year. If it is 2 meters tall now, how tall will it be in 3 years?

• 8 meters

• 4 meters

• 16 meters

• 32 meters

A bacteria culture doubles in size every hour. If you start with 5 bacteria, how many will there be after 4 hours?

• 10

• 80

• 40

• 160

A computer's processing speed is 2^3 gigahertz. What is the processing speed in gigahertz?

• 2 gigahertz

• 16 gigahertz

• 4 gigahertz

• 8 gigahertz

A certain species of fish can reproduce every 2 months. If one fish reproduces 2 offspring each time, how many fish will there be after 6 months?

• 20

• 30

• 27

• 15

A cell phone battery lasts for 2^4 hours on a full charge. How many hours does the battery last?

• 16 hours

• 20 hours

• 8 hours

• 12 hours

A video game character gains experience points at a rate of 3^2 points per level. How many points does the character gain after 2 levels?

• 6

• 12

• 24

• 18

A plant grows at a rate of 2^5 centimeters per week. How much will it grow in 3 weeks?

• 64 centimeters

• 80 centimeters

• 48 centimeters

• 96 centimeters

A savings account earns interest that doubles every year. If you start with $100, how much will you have after 2 years?

• $500

• $400

• $200

• $300

A light bulb's brightness is measured in lumens, and a certain bulb has a brightness of 10^2 lumens. What is the brightness in lumens?

• 100

• 75

• 200

• 50

A computer file size is 2^10 bytes. How many bytes is that?

• 1024 bytes

• 2048 bytes

• 512 bytes

• 256 bytes