Yooo what is 400^3xCube root of 9?

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ac=26 and ch=8, find bh.