Which of the following three-dimensional solids cannot be generated by rotating a two-dimensional figure around an axis? sphere

pyramid

cylinder

cone

Need so much on this one how many yards?

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! )

Ineed to find the answer to number 2