the first picture, #19, is C. the reason for this is because they charge a FLAT rate of $10 and a variable rate of $4 for each hour that she rented the bike.
for the other problem, the answer is C. they charge a flat rate of 5.50 to get into the carnival and charge 89 cents per ride, which means that it needs a variable. furthermore, the problem states that he can spend up to $26.
