3. [P] Find the equation of the plane tangent to the paraboloid dened by f (x, y) = 169:2 4y2 at the point (2,1,8). 4. A projectile is red

Hello I need help with calculus III.

I have keys but can't understand how it came out.

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3. [P] Find the equation of the plane tangent to the paraboloid defined by f (x, y) = 16—9:2 —4y2at the point (2,1,8). 4. A projectile is fired perpendicularly to the surface 2 = g from the point (4, —2, —2) andtravels in a straight line until it hits the surface again.(a) Find a vector function for the line in which the projectile traveled.(b) Find Where the projectile hits the surface again.(c) How far did the projectile travel?