Which expression is equivalent to 1/3b - 7?

-1/3(b+21) 1/3 (b-21) -1/3 (b-21) 1/3(b+21)

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?