Question

Can she talk for 15 minutes without going over a budget of $25?

Answer 1

We are given that the function for the cost of a call is:

$C=2+1.5t$

Now, we determine the cost for speaking for 15 minutes by substituting the value of "t = 15":

$C=2+1.5(15)$

Solving the operations:

$C=24.5$

Since the cost is less than 25 this means that she can talk for 15 minutes and she would spend $24.5.