The lateral surface area of a cone of radius r and height h (the surface area excluding the base) is A = grv? +h?. Complete parts (a) and (b). dr dr for a cone with lateral surface area of A = 1625r. What is the best method to use to find- dh a. Find dh O A. Solve the equation A = gr +h? for h and take the derivative with respect tor. B. Use implicit differentiation to find dr/ dh. Differentiate both sides of the equation with respect to h, treating r as a differentiable function of h. Then solve for dr/ dh. O C. Use implicit differentiation to find dr/ dh. Differentiate both sides of the equation with respect to A, treating r as a differentiable function of A. Then solve for dr / dh. OD. Solve the equation A = ar +h? for r and take the derivative with respect to h. dr Find an expression for dh dr dh

Use the tangent plane to approximate a function of two variables at a point. Use a tangent plane at (1,-6) to approximate the value of the following function at the point (1.1, −6.1): -4x²+2y²-7z = 19 Present your answer accurate to 4 decimal places. Question Help: Video Submit Question Search As

What is the slope of the tangent line to y + xy = 12 at the point (1, 3)? A. -¹5 B. 2 233 C. D. -

Can you please help me answer this one in handwriting please?