If the function f(x) = x^2 has the domain of 0,1,4,9 what is its range?

Average acceleration: i have no idea how to do this.

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?

When solving a logarithm equation, how do you find the missing variable ?