Estimate time stuffing 150 envelopes with one insert, stamp, address label, return address label and sealing

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.

Ineed with number 6 , explain how to get 1978

Opposite angles in a parrellelogram are