B. Write the equation of variation for each of the following statements.
1)F varies as R and inversely as N
2)x varies directly as y and inversely as the cube of z.
3)the length(1)of rectangle varies directly as the area (A)And inversely as the width(w)
4)the pressure(P)of a gas varies directly as it's temperature (T)And inversely as it's volume(V)
5)the safe load(S)for horizontal beam supported at both ends varies jointly as width(w)and the aquare of it's depth(h)and inversely as the distance(d)between the supports.​