During the winter, you charge people $12 for going to their house to shovel, then $9 every hour you shovel. if you make $57 one day, how many hours did you spend shoveling? (solve the equation)

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?