$\text { Find the differential of the function } z = \frac { x + 5 y } { x - 6 y } \text {. }$

Q12: Find equations for the tangent plane

Q13: <span class="ql-formula" data-value="\text { Find the first

Q14: Find the limit <span class="ql-formula"

Q15: Use Lagrange multipliers to find the

Q16: Suppose that over a certain region

Q18: Find the directional derivative of the

Q19: Use differentials to estimate the amount

Q20: The length <span class="ql-formula" data-value="l"><span

Q21: <span class="ql-formula" data-value="\text { Determine where the

Q22: Let <span class="ql-formula" data-value="g (