A number added to the product of eight and the number

1. Translate into a variable expression. (Use x for your variable. Do not simplify.)

2. Simplify.

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?

Can someone answer this question? : )

You can find the constant of proportionality by finding the ratio of