A 90-foot rope from the top of a tree house to the ground forms a 45° angle of elevation from the ground. How high is the top of the tree house? Round your answer to the nearest tenth of a foot.

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults. how many students and adults went if the ticket charge was $42.75

which of the following sets of data would produce the largest value for an independent-measures t statistic? the two sample means are 10 and 20 with variances of 20 and 25 the two sample means are 10 and 20 with variances of 120 and 125 the two sample means are 10 and 12 with sample variances of 20 and 25 the two sample means are 10 and 12 with variances of 120 and 125

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?