Five students measured the mass of the rock. Their reading were 95.1g

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

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?

Which of these numbers of simulations of an event would be most likely to produce results that are closest to those predicted by probability theory? 15, 20, 5, 10