PLS HELP! Which of the following triangles are acute triangles?

a) 5, 14, 20
b) 4.5, 6, 10.2
c) 8, 8, 11
d) 10, 13, 16
e) 4, 7, 9
f) 9, 12, 15

Solve the x in the equation x^2+14x+17=-96

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.

Triangle xyz has vertices x(1,3), y(0,0)