1. Use traces to sketch and describe the quadric surface. x2 + 4y2 - 25z2 = 100
2. At what points does the curve r (t) = ti + (4t-t2)k intersect the parabolid z = x2 + 3y2?
3. Graph the domain of the function in the xy-plane. f(x, y) = √y + √(16 - y2 - x2)