Brenna has already spent 69 minutes on the phone, and she expects to spend 1 more
minute with every phone call she routes. in all, how many phone calls does brenna have to
route to spend a total of 88 minutes on the phone?

Brenna has to  route  19 phone calls to spend a total of 88 minutes on the phone

Step-by-step explanation:

The time Brenna has already spent on phone = 69 minutes.

Total time she is to spend on the phone = 88  minutes

So, the minutes left yet =  88 minutes-   69 minutes

=  19 minutes

Now, for each calls she routes, she spends 1 minute extra.

So, in 19 minutes duration she can route EXACTLY 19 calls.

Hence, Brenna have to  route  19 phone calls to spend a total of 88 minutes on the phone.

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step-by-step explanation:

the answer to the expression is 83