Composite numbers are numbers that have the same set of factors
Since we are looking for the time it takes for the stone to hit the ground, then it means that we set the height y to 0 ft.
y = -16t² + 486
0 = -16t² + 486
16t² = 486
t² = 30.375
t = 5.51 seconds
24 9/20 = 489/20
round 489 to 1sf like 20 is
500/20 = 25
