Question 635638
Hello, 
This 220 X 4^(-0.02t) = 1540
We first divide by 220
4^(-0.02t) = 7
Rewritten as log we get:
Log base 4 7=-0.02t
Divide by -.02
(Log base 4 350)/-0.02 = t
Using scientific calculator we get:
t=-70.184 (rounded off)
Make sense?
RJ
www.math-unlock.com