The value of y is directly proportional to the value of x. If y is 24 when x is 60, what is the value of y if x is 75

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?

What is the value of x in the following equation. -x ^3/2 = -27

Is the square root of 4 plus the square root of 16 rational?