Me find the missing angles. (question 5) i’m so confused

Prove that quadrilateral is a rhombus.

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

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?