C
because it is the only logical answer
If the ball hit the ground it means that its height is equal to 0. In order to find the time after the ball <span>will hit the ground, we need to find the solution of the equation h(x)=0 which is different to 0.
-4.9x^2+21.3x=0
x(-4.9x+21.3)=0
-4.9x+21.3=0
x=21.3/4.9 = 4.3469 seconds</span>
C. 40
30x30=900
40x40=1600
total of 2500 take the square root and your left with 50 so everything balances out
-4,-3,-2,-1,0
which means 4 numbers
The answer is dddddddddddd
