I'm having trouble on my math assignment

Question

Use the properties of exponents to rewrite y=5e^{-0.7t} in the form y=a(1+r)^t or y=a(1-r)^t . Round the value of r to the nearest thousandth. Then find the percent rate of change to the nearest tenth of percent.

Answer 1

5e^-0.7t = 5(1 + r)^t

e^-07t = (1 + r)^t

e^-0.7 = 1 + r

Can you solve for r and answer?