I really need help :(

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

Which strategy is used by public health to reduce the incidence of food poisoning?

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! )