Can y’all help me on question 1?! Have a good day everyone!

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?

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount

Write the equation in general quadratic form: plz !