Suppose a class has 27 freshmen, 20 sophomores, 32 juniors, and 19 seniors in it. if 4 student names are drawn from a hat with replacement, what is the probability that all the draws result in freshmen?

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?

Atheater wants to build movable steps that they can use to go on and off the stage. they want the steps to have enough space inside so they can also be used to store props. how much space is inside the steps?