Joanne hit a ball straight up into the air. the height of the ball in meters, is given by the function h(t)=-5(t-3)2+45 t seconds after the ball is hit. in how many seconds will the ball hit the ground

  6 seconds

Step-by-step explanation:

The height is zero when ...

  0 = -5(t -3)^2 +45

  0 = (t -3)^2 -9 . . . . . divide by -5

  9 = (t -3)^2 . . . . . . . add 9

  ±3 = t -3 . . . . . . . . . . square root

  3 ±3 = t . . . . . . . . . . .add 3

The height of the ball is zero when t=0 and when t=6.

It will take 6 seconds for the ball to hit the ground.

yes the total will be same because in both of them the expression.is rearranged but their sign remains the same hence it hss just been shuffled