I don’t understand what I’m supposed to do with this question ( Evaluate: log125^5) ?

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)

Plz. yesterday, the snow was 2 feet deep in front of archie’s house. today, the snow depth dropped to 1.6 feet because the day is so warm. what is the percent change in the depth of the snow?

Which of the following would be a reasonable estimate for the weight of a pencil? a. 1 × 10^-20 lb b. 1 × 10^20 lb c. 1 × 10^2 lb d. 1 × 10^-2 lb