Free Digital SAT Exponential Growth/Decay Practice Problems with Video Explanations

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1. A laptop was purchased for $960. Its value decreases by 15% each year after it is purchased. Which function models the value $V$ , in dollars, of the laptop $t$ years after it is purchased?

A) $V(t)=960(0.15)^t$

B) $V(t)=960(1.15)^t$

C) $V(t)=960(0.85)^t$

D) $V(t)=960(1.85)^t$

Question 1 of 3

2. The function $P(t)=4,200(1.04)^{\dfrac{t}{5}}$

models the population of a wildlife preserve $t$ years after a study began. Which statement best describes the population according to this model?

A) The population increases by 4% every 5 years.

B) The population increases by 5% every 4 years.

C) The population increases by 4% every year.

D) The population increases by 5% every year.

Question 2 of 3

3. The function $A(t)=18,000(1.1025)^{\dfrac{t}{2}}$

models the amount, in dollars, in an investment account $t$ years after the account was opened. According to this model, by what percent does the amount in the account increase every 8 years?

A) 21%

B) 33.1%

C) 46.41%

D) 47.75%

Question 3 of 3

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