Read the growth or decay rate from y = a(1 ± r)ᵗ

Question 1

Sam's laptop battery loses 20% of its remaining charge every hour. What number is the charge multiplied by each hour? Give a decimal.

Answer 

Question 2

y = 700(1.15)ᵗ. Which describes the change each time period?

• A. growth of 115%
• B. decay of 15%
• C. growth of 15%

Question 3

Fatima's video channel has 2000 subscribers and grows by 8% each month. Which model gives the subscribers after t months?

• A. y = 2000(0.08)ᵗ
• B. y = 2000 + 8t
• C. y = 2000(1.08)ᵗ
• D. y = 2000(0.92)ᵗ

Question 4

Jamal's laptop battery loses 10% of its remaining charge every hour. What number is the charge multiplied by each hour? Give a decimal.

Answer 

Question 5

y = 290(1.04)ᵗ. Which describes the change each time period?

• A. growth of 4%
• B. decay of 4%
• C. growth of 104%

Question 6

A medicine dose of 1200 mg in the body falls by 25% each hour. Which model gives the amount after t hours?

• A. y = 1200(0.25)ᵗ
• B. y = 1200(0.75)ᵗ
• C. y = 1200(1.25)ᵗ
• D. y = 1200 − 25t

Question 7

Sam's laptop battery loses 10% of its remaining charge every hour. What number is the charge multiplied by each hour? Give a decimal.

Answer 

Question 8

y = 470(0.97)ᵗ. Which describes the change each time period?

• A. growth of 3%
• B. decay of 3%
• C. growth of 97%
• D. decay of 97%

Question 9

Zoe's video channel has 2350 subscribers and grows by 6% each month. Which model gives the subscribers after t months?

• A. y = 2350(1.06)ᵗ
• B. y = 2350(0.94)ᵗ
• C. y = 2350(0.06)ᵗ
• D. y = 2350 + 6t

Question 10

Kwame's laptop battery loses 25% of its remaining charge every hour. What number is the charge multiplied by each hour? Give a decimal.

Answer 

Question 11

y = 510(0.95)ᵗ. Which describes the change each time period?

• A. decay of 5%
• B. decay of 95%
• C. growth of 95%
• D. growth of 5%

Question 12

A medicine dose of 1200 mg in the body falls by 12% each hour. Which model gives the amount after t hours?

• A. y = 1200 − 12t
• B. y = 1200(1.12)ᵗ
• C. y = 1200(0.12)ᵗ
• D. y = 1200(0.88)ᵗ

Question 13

Ines's laptop battery loses 10% of its remaining charge every hour. What number is the charge multiplied by each hour? Give a decimal.

Answer 

Question 14

y = 270(0.75)ᵗ. Which describes the change each time period?

• A. decay of 75%
• B. growth of 25%
• C. growth of 75%
• D. decay of 25%

Question 15

A medicine dose of 400 mg in the body falls by 25% each hour. Which model gives the amount after t hours?

• A. y = 400(1.25)ᵗ
• B. y = 400 − 25t
• C. y = 400(0.25)ᵗ
• D. y = 400(0.75)ᵗ

Question 16

Sofia's laptop battery loses 5% of its remaining charge every hour. What number is the charge multiplied by each hour? Give a decimal.

Answer