Write an expression for the calculation the difference of 35 and 7 divided by the difference of 9 and 2

What is the slope of the line shown below?

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

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?