I don’t know how can i solve this question can you help it is trigonometry

I’m stuck on this i don’t understand.

What is the value of 1/3x + 7x when x = 5

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?