Can someone tell me the answer step by step about the surface area really i need

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

Lucy is a dress maker. she sews \dfrac47 7 4 of a dress in \dfrac34 4 3 hour. lucy sews at a constant rate. at this rate, how many dresses does lucy sew in one hour? include fractions of dresses if applicable

If there is 20 dogs in the shelter and 5 dogs get homes, and then 43 more dogs come. how many dogs are there in the shelter?