A committee must be formed with 2 teachers and 3 students. If there are 10 teachers to choose from, and 13 students, how many different ways could the committee be made? ​

What is the missing constant term in the perfect square that starts with x^2 -20x

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

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.