1. Let T be the trapezoid in the ry-plane bounded by the lines y = z/2, y = 4-z, y = 0 and y = 1. The density (in g/cm?) of T is modeled by p(r, y) = 4y. Calculate the mass of the trapezoid. 2. A metal object M in R3 is in the region defined by the following system: yz I y 2 - I -1