Is this positive slope or negative slope??

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

Prove that (x-2)is factor of p (x)=2x³-3x²-17x+30

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! )