Heidi N. answered • 05/23/19

Math and Proofreading Tutoring - UC Berkeley

Hi Evelyn,

We are told that **x** represents "the number of days after the area has been treated."

We have a function for predicting the number of termites left in an area after **x **number of days:

f(x) = 10,000 - 1,500**x**

Let's plug 5 in for x, since we want to know the number of termites left in an area after **5 **days:

f(5) = 10,000 - (1,500)(5)

To see what this equals, first we have to do the multiplication: (1,500)(5) = 7500. So:

f(5) = 10,000 - 7500 = 2,500

So, to answer the question, after 5 days, it is predicted that there will be 2,500 termites in the area.

I hope this helps you!