Which is the answer from these?

What are the soultion(s) to the quadratic equation 40- x^2=0

Iwill give you ! what is the measure of ∠v ?

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?