A new streaming service charges an initial setup fee of $15 and a monthly subscription fee of $8. If a customer paid a total of $111 for the service, which of the following equations represents , the number of months the customer subscribed to the service?
$8m + 15 = 111
$15m + 8 = 111
$8m - 15 = 111
$15m - 8 = 111
