Final answer:
Margaret can talk for 15 minutes without going over her budget of $25.
Step-by-step explanation:
To determine if Margaret can talk for 15 minutes without going over her budget of $25, we need to calculate the cost of the call for 15 minutes. The cost of the call is $3 for the connection fee plus $1.40 per minute. So for 15 minutes, the cost would be $3 + ($1.40 x 15) = $3 + $21 = $24. Therefore, Margaret can talk for 15 minutes without going over budget.