Sarah rented a bicycle for a day. The rental company charges a flat fee of $15 plus $12 per hour. If Sarah paid a total of $75, which of the following equations represents the number of hours, , Sarah rented the bicycle?
$15h + 12 = 75
$12h + 15 = 75
$12h - 15 = 75
$15h - 12 = 75
