Solve 4x^2-16x-84 by factoring, completing the square and, by quadratic formula(show work, pls)20 points

What are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)

Akitchen is 12 ft. by 14 ft. with 10 ft. high walls. how much would it cost to put vinyl flooring in this room? $8.80 per ft

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?