Given f(x)=3x^3+kx-8, and the remainder when f(x) is divided by x-3 is 43, then what is the value of k?

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?

Use the distance formula to find the distance between (-3,5) and (3,1)

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18