Question

1. A population of tropical fish is decreasing at an annual rate of 6% per year. (a) Write an equation to represent the total population of tropical fish as a function of time in years. (b) What is the monthly rate of decrease? Show your work.

Answer 1

Assuming that x is the population of tropical fish,

The equation to represent the total population would be :

y = x - 0.06x

y = 0.94 x

The monthly rate of decrease would be : 6 % / 12

= 0.5 %