How do I do this? Someone help please?

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?

We have 339 ounces of jam to be divided up equally for 12 people how muny ounces will each person get

Point q is equidistant from the sides of ∠tsr. find m∠rst.