Question 767375
S = 12.75 e^-0.0425t
Find t when S = 7.35
S = 12.75 e^-0.0425t
7.35 = 12.75 e^-0.0425t
7.35/12.75 = e^-0.0425t
0.57647 = -0.0425t e
log e both sides
(Notice how the -0.0425t comes in front of e)
loge 0.57647 = -0.0425t loge e
(loge e = 1)
loge 0.57647/-0.0425 = t
t = 12.96
Hope this helps.
:-)