2. Consider a radially hilly terrain whose elevation can approximately described by z = 608(272 + yz). (a) What is the gradient of the terrain? (b) Find the angle of inclination of the tangent plane of the surface as a function of a: and y. (c) Consider a hiker leaving the central hill of the terrain P(0,0) in a straight line given by L(t) = t(1, 1/ 2). What is the slope of the terrain in the direction the hiker is walking as a function of t