Hello everyone if you could help me that would be awesome

Part A) 27.93/7 for small bags and 66.98/20 for large bags
Part B) $3.99 for small bags and 3.35 for large bags
Part C) the large bags is the better buy because the small bags are $0.64 more than the large bags.

First we need to find the rate that they charge per hour
this would be
(7.75 - 5.50) divided by (7 - 4)

which equals
(2.25) / (3) = 0.75

so they charge $0.75 per hour

then to find how much 3 hours cost, we subtract 0.75 from 5.50
5.50 - 0.75 = 4.75

therefore it costs $4.75 to park for 3 hours