Can anyone help me with #3 and #4 and #6 please I will give brainlist!!

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

Atemperature of 1.64◦f corresponds to answer in units of ◦c.

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?