Let D be a region of area 9 located in ay-plane. Let S be the surface above D given by z = 3x + 6y + 8, where (, y) ED. Find the surface area of S. Area( S) = Answer entry help: 1. No blank spaces are allowed in the answer fields 2. If your answer Area(S) = Z please write only Z in the answer box. Note that Area( S) = is already written. Thus, if you put Area(S) = Z in the answer box, the system will read this as Area(S) = Area(S) = Z and will treat as a wrong answer. 3. Write v*z for v . z (multiplication of v by z ) Write v^(z) for vz (parenthesis are required) Write sqrt(z) for vz (parenthesis are required) Check