d(x,y,z)=x+y+

3. Let a > 0 and h > 0. Consider the triangular region R whose vertices are (0,0), (a,0), and (0,h). (a) Find a formula for the line that represents the hypotenuse of the triangle. (b) Show that the center of gravity of R is (a/3, h/3). (The center of gravity of R turns out to be the centroid of the triangle. However, you need to find the center of gravity of R in this problem by the method of Section 6.5.)

please make the answer easy to read

(10) Sketch the solid bounded by z = x² + y2 and z = 4- x2 - y². Use cylindrical coordinates to find fff, x² + y2 dV.