A1 = 96 and an = 7 an-1

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?

Which is the focus of a parabola with equation y2=4x

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.