The library question , and can u explain, i’ll give many points

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?

One integer is 8 times another. if the product is 72, then find the integers

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x