Which expression is a quadratic binomial?

a. x^2-9x
b. 7x^2
c. 2x^4+9x^2-6x-1
d. 3x^4-2^x

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

Identify one charcteristic of exponential growth

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! )