CAN SOMEONE HELP!! Please and thank you

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

Afootball quarterback has two more chances to throw a touchdown before his team is forced to punt the ball. he misses the receiver on the first throw 25% of the time. when his first throw is incomplete, he misses the receiver on the second throw 15% of the time. what is the probability of not throwing the ball to a receiver on either throw?

Find the rate of change for the situation. you run 7 miles in one hour and 21 miles in three hours.