In interval estimation, the t distribution is applicable only when a. the population has a mean of less than 30. b. the sample standard deviation (s) is given instead of the population standard deviation (σ). c. the variance of the population is known. d. the standard deviation of the population is known. e. we will always use the t distribution

You drop a rubber ball off the roof of a 50 meter high building onto a paved parking lot. it bounces back up with every bounce, but not quite all the way back up to you. after the first bounce it bounces back only 80 percent of the distance it was dropped from. the pattern continues, meaning after every bounce it comes up to just 80 percent of the previous maximum height. so if before the first bounce the height is 50 meters, what height does the ball reach after the fifth bounce? round your answer to one decimal place and chose the correct response from the choices below:

Is there an x intercept in the equation 60*1.15^x

Select the correct answer and solve for y