If f(x) is a linear function, find the value of f(-3) if f(2)=9 and f(-2)=7

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?

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b