"the product of 5 and a number (t), less 15, is 25."​

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 not true about kl and mn? what is mn? (show your work)

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?