The graph of a function fis shown below. Graph Graph Description alnteractive 3D Graph 9| Help Z Find an equation of the tangent plane to the surface 2 = f(x, y) at the specified point. x, y) = 15 X2 yz 2:4xy18 X Find the linear approximation of the function f(x, y, z) = l x2 + y2 + 22 at (2, 4, 4) and use it to approximate the number '1/ 2.012 + 3.982 + 3972. (Round your answer to five decimal pieces.) f(2.01, 3.98, 3.97) : {31.72000 x The voltage V in a simple electrical circuit is slowly decreasing as the battery wears out. The resistance R is slowly increasing as the resistor heats up. Use Ohm's Law,l/ = IR, to find how the current I is changing at the moment when R = 383 0., I = 0.06 A, dV/dt = 0.03 V/s, and dR/dt = 0.05 (1/5. (Round your answer to six decimal places.) :lA/s