Solve for s please help me besties!

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?

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

The square root of 9x plus 7 plus the square rot of 2x equall to 7