Four less than the product of one and a number x ? but i just need how to write it not how to answer it.

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?

The graph shows the distance kerri drives on a trip. what is kerri's speed?

What is the equation of the line that is parallel to the line with the equation y= -3/4x +1 and passes through the point (12,-12)