Don’t quite understand.

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?

Rectangle leg this 11feet and perimeter of 38feet what is the width of the rectangle in feet

Find the maximum value of p= 4x + 5y subject to the following constraints :