WidgetsAreUs manufactures and sells widgets. The company's weekly revenue depends on the price it charges for a widget and the amount it spends on advertising. The figure above is a contour diagram of that revenue. One of the axes corresponds to the price of a widget and the other corresponds to the amount spent on advertising. a) Which axis (horizontal or vertical) corresponds to the amount spent on advertising? b) Explain your answer in part (a). W(t,s) windchill as a function of air temperature (t) and wind speed (s) slt 0 5 10 15 20 25 30 35 5 -11 -5 1 7 13 19 25 31 10 -16 -10 - 4 3 | 9 | 15 | 21 | 27 15 -19 -13 -7 0 6 13 19 25 20 -22 -15 -9 - 2 4 11 | 17 24 25 -24 -17 -11 -4 | 3 | 9 | 16 | 23 a) Use the table above to estimate Ws(20, 15), the partial derivative of W with respect to s at the point (30, 15). WidgetsAreUs manufactures and sells widgets. The company's weekly revenue depends on the price it charges for a widget and the amount it spends on advertising. The figure above is a contour diagram of that revenue. One of the axes corresponds to the price of a widget and the other corresponds to the amount spent on advertising. a) Which axis (horizontal or vertical) corresponds to the amount spent on advertising? b) Explain your answer in part (a). W(t,s) windchill as a function of air temperature (t) and wind speed (s) slt 0 5 10 15 20 25 30 35 5 -11 -5 1 7 13 19 25 31 10 -16 -10 - 4 3 | 9 | 15 | 21 | 27 15 -19 -13 -7 0 6 13 19 25 20 -22 -15 -9 - 2 4 11 | 17 24 25 -24 -17 -11 -4 | 3 | 9 | 16 | 23 a) Use the table above to estimate Ws(20, 15), the partial derivative of W with respect to s at the point (30, 15)