H = -3t2+ 14t + 5. a) How long will it take for the rocket to hit the ground?
b) Find the time when the rocket is 5 feet from hitting the ground.

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b