There are 9 students in a class: 7 boys and 2 girls.

if the teacher picks a group of 3 at random, what is the probability that everyone in the group is a boy?

In the diagram below, dab and dac are adjacent angles. if mdac = 25°, what is mdab in degrees? what is mbac in degrees?

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

David must install fencing around a lot that is shaped like a right angle.the side of lot that runs east-west is 200 ft long.the side of the lot runs north-south is 125 ft long.calculate how many feet of fencing he will need to surround the entire lot.