Given the vector field, G = 2x²y ax - 2(z-x) ay + 3xyz az, find (a) G at P(2,-3,4); (b) a unit vecotr in the direction of G at P; (c) the (scalar) equation of the surface on which |G| = 100; (d) the y coordinate of Q(-3,y,5) if |Gq| = 100 and y > 0; (e) the distance between P and Q.