Aball is dropped from a height of 64 feet. its height, in feet, can be modeled by the function h(t) = -16t square + 64, where t is the time in seconds since the ball was dropped. after how many seconds will the ball hit the ground?

Summary statistics given for independent simple random samples from two populations. use the pooled t-interval procedure to obtain specified confidence interval. x1=71.6, s1=3.9, n1=11, x2=67.9, s2=3.4, n2=9 determine a 99% confidence level.