math  Help
posted by Jane .
The value of a $20,000 car decreases every year, t. The equation below model this situation.
20,000(10.04t) = 13,000
How many years will the car be worth $13,000? Round to the nearest tenth if necessary.
I got 20,000(.96t)= 13,000, but I don't believe gives me the correct answer. Help!

Damon answered this for you yesterday, and pointed out your typo
http://www.jiskha.com/display.cgi?id=1335108312
I also agree that your equation should read
20000(1.04)^t = 13000
then .96^t = .65
take log of both sides
log (.96^t) = log .65
use log rules ...
t(log .96) = log .65
t = log .65 / log .96 = 10.5527 = appr 10.6 years
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