Question

The weight of bacteria in a culture t hours after it has been established is given by W=2.5*2^0.04t.
After what time will the weight reach:
a) 4 grams
b) 15 grams?
(On a section about logarithms)

Answer 1

I think:
w=4 ->2.5*2^0.04t=4 ->t
w=15 ->2.5*2^0.04t=15 ->t

Answer 2

Yes I understand that, but how do you solve for t?

Answer 3

t=w/(2.5*2^0.04)=4/(2.5*2^0.04)