Simple interest of $1295 at 7% for 180 days

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?

Don't know how to find x given these segment lengths

Reagan lives five miles farther from school than vanessa lives. write an expression to describe how far reagan lives from school