Aball is dropped from the top of a building. the expression 4.9x^2 gives the distance in meters the ball house phone after x seconds. right and simple fly in expression gives the distance in meters the wall has fallen after x squared seconds after x cubed seconds

The given general formula is 

Distance = 4.9x², where x is in seconds

The first case is when the time is after x² seconds. So, if x=x²,
Distance = (4.9)(x²)² 
From the laws of exponents, we multiply 2*2.
Distance = 4.9x⁴ meters

The second case is when the time is after x³ seconds. So, if x=x³,
Distance = 4.9(x³)²
Distance = 4.9x⁶ meters