Please help....this is similar to another question. Setting: U.S. Auto manufactu

Question

Please help....this is similar to another question.

Setting: U.S. Auto manufacturers are trying to develop a multivariate function with which to estimate the demand for their gas-electric hybrid compact cars. Here is one that Motors General developed for its Jolt: Qi-65000-20 P? + 20Pf + 35 Pt-5Pb + 0.2Tc + 0.05Y + 10Mg + 0.04A Where Qithe number of Jolts demanded per week. Pithe price of each new Jolt (in S). Pf- the price of each new Ford gas-electric hybrid (in S). Pt- the price of each new Toyota gas-electric hybrid (in S) Pb-the price of replacement batteries for the Jolt (in S). Tc -the amount of tax credit incentive offered with the purchase of a new hybrid (in S). Yaverage weekly disposable income of a typical Jolt purchaser (in S). Mg the miles per gallon of gas rating of the Jolt (in miles per gallon) average weekly Jolt advertising expenditure (in S) VI. The partial derivative of the demand for Jolts with respect to advertising (A) is: (Circle one) -20 5 .04 +10 +20 +35

Explanation / Answer

The partial derivative assumes all variable other than the one being differentiates as constants. So derivative for all variables other than advertisement are zero and we only differentiate the required variable which is advertising in our case.

The partial derivative from the given equation for advertising will then be 0.04.

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