Aclass consists of 10 male and 10 female students. if four students are selected at random, without replacement, what if four students are selected at random, without replacement, what is the probability that all four are male

What is the measure of x, in degrees

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches. approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *

Which expression is the factorization of x^2+10+21