What is 3.1 - 4.9(x + 1)

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height

Which of the following graphs could represent a quartic function?

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! )