Randomly distributing 45 pencils and 35 markers to his students. what is the probability that the first item he hands out will

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

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! )

Yvaries inversely as x. y =12 when x=5. find y when x=4