(20 pts.) 3. (a) A thin wire has the shape of the parabola y = x2 from the origin to the point (1,1) and the line segment from (1. 1) to (1, 2). The density of the wire at the point (&x, y) is given by f(x, y) 2x kg/m. Use the method discussed in class to find the total mass of the wire. (b) A solid has the shape of the region E enclosed by x2 + y2 + ( 2-4. The density of the solid at the point (x, y, z) is given by f(x, y, z) = (x2 + y2 + z 2) n kg/m. Use the method discussed in class to find the total mass of the solid.