Write the number in two other forms 8.517

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

Which of the following best describes the delian problem?

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )