What are the answers cause I keep getting different answers when I check my work

Cassie is traveling 675 miles today to visit her brother and his family. so far, she has stopped for gas three times. at the first stop, she put in 7.1 gallons of gas and paid $23.79. at her second stop, she put in 5.8 gallons of gas and paid $19.08. and, at the third stop, 6.6 gallons and paid $20.39. at which stop did casey pay the most for gas?

Which expression is equivalent to 3^3 + 2^2?

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a