Question

The price of 9-volt batteries is increasing according to the function below, where t is years after January 1, 1980. During what year will the price reach $4?

P(t) = 1.1 e^(0.047t)

Answer 1

4=1.1 e^(0.047t)

Answer 2

divide both side by 1.1

Answer 3

4/1.1=e^(0.047t)

Answer 4

ln (4/1.1)=0.047t

Answer 5

so wats t?

Answer 6

for you to solve

Answer 7

so do i divide ln(4/1.1) by 0.047?

Answer 8

Yes

Answer 9

yes

Answer 10

27.46
is that correct?

Answer 11

but the question is asking what year will the price reach $4