Consider functions f and g. f(x) = sqrt(x^2+ 12x + 36)
g(x) = x^3– 12

Which expression is equal to f(x) · g(x)?

A. x^4 - 12x^3 + 61 - 72
B. 7x^3 – 12x – 72
C. X^4 + 6x^3 - 12x-72
D. X^4 – 6x^3 – 12x + 72

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! )