Home > Precalculus > The Natural Base e

The price of 9-volt batteries is increasing according to the function #P(t) = 1.1e^(0.047t)# , where #t # is years after January 1, 1980. During what year will the price reach $5?

Answer 1

Serenity Johnson

The price of 9-volt batteries reach #$5# in the year #2012#.

Let the price of 9-volt batteries reach #$5# aafter #t# tears,

Then #P(t)=1.1xxe^(0.047t)=5#

and hence #e^(0.047t)=5/1.1#

and #0.047t=ln(5/1.1)=ln5-ln1.1=1.609438-0.095310=1.514128#

and #t=31.215#

Hence the price of 9-volt batteries will reach #$5# in the year #1980+32=2012#

By signing up, you agree to our Terms of Service and Privacy Policy

Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

Trending questions

Not the question you need?

HIX Tutor

Solve ANY homework problem with a smart AI

98% accuracy study help
Covers math, physics, chemistry, biology, and more
Step-by-step, in-depth guides
Readily available 24/7