Which are differences of perfect cubes? Select two options

9a^3-27
125a^12-72
216-27y^3
8a^15-27
225a^3-216

What is the 12th term of b(n)=-4-2(n-1)

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?

Evaluate cos2θ for cosθ = square root of 3/2