Alexis washes 10 1/2 windows in 3/4 hours. At this rate, how many windows can she wash in an hour

Let the mean of the population be 38 instances of from 6" - 9" hatchings per nest, and let the standard deviation of the mean be 3. what sample mean would have a confidence level of 95% or a 2.5% margin of error?

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

How many $20 bills do you need to have to make $280