3. Circle the function on the answer sheet that represents the marginal revenue (MR) function for this demand function: Q = 90 - 4.6P 4. Circle the quantity that maximizes total revenue (TR) for the marginal revenue (MR) function selected in number three (3). 5. If supply increases and demand also increases, we can conclude that the new equilibrium: The multivariate demand function (below) is needed for Questions 6 - 12. 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: Qj = 65000 - 20Pj + 20Pf + 35Pt - 5Pb + 0.2Tc + 0.05Y + 10Mg + 0.04A Where: Qj = the number of J olts demanded per week. Pj = the price of each new Jolt (in $). Pf = the price of each new Ford gas-electric hybrid (in 55). Pt = the price of each new Toyota gas-electric hybrid (in $). 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 $). Y = average weekly disposable income of a typical Jolt purchaser (in 55). Mg = the miles per gallon of gas rating of the Jolt (in miles per gallon). A = average weekly Jolt advertising expenditure (in $). 6. If all variables remain unchanged except that the price of J olts (Pj) increases by $1000, then the quantity demanded of J olts will: 7. If all variables remain unchanged except that the average weekly disposable income (Y) increases by $350 then demand for Jolts will: 8. You can tell by looking at the sign of the price of Toyota hybrids (Pt) that they are considered: 9. The partial derivative of the demand for J olts with respect to the price of replacement batteries mm in