Question

A bike tire just ran over a nail, and it is losing pressure at a rate of 5% every minute. The tire pressure is currently 900 kilopascals. What will it be in 7 minutes?

Answer 1

9514 1404 393

Answer:

629 kilopascals

Explanation:

The tire pressure is given by the exponential function ...

p(t) = 900·0.95^t

where t is in minutes and p is in kilopascals.

p(7) = 900·0.95^7 ≈ 629 . . . . kilopascals