What is 13*81/2 it is for my math homework and if i dont get this i will fail math can someone me

Find an equation (in term of x) of line through the points (-1,3) and (1,4)

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?

The polygon tool to draw a rectangle with a length of 5 units and a height of 3 units. one of the sides of the rectangle falls on line ab , and the rectangle has a vertex of a. each segment on the grid represents 1 unit.