What is the area of a regular pentagon with side length a?

If a(0,0,0) and b(2,2,2) are points in coordinate space, how many paths are there from a to b that move from one lattice point to another in the positive x-,y- or z- direction?

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.