t=ageofthecarV=volumeofengineD=numberofdoorsA=accessoriesandstyle1t5(years)1000V2,500(cubiccentimeters)D=2,3,4,5A=1,2,3,4,5,6(qualitative) Using regression analysis, the following relationship between the cost of a car and the four independent variables was found: Purchasecost=(1+t1)V(2D+A) a. Plot the purchase cost as a function of the four variables. b. Which variable has the greatest effect on cost? c. You have a total of $5,000. List the different types of cars (combinations of the parameters) that you can afford. d. Develop a model by which you select the best car for your needs e. Operations and maintenance costs for the car are estimated as follows: annualmaintenancecost=2tV1,000sannualoperatingcost=(Dt+1,000V)250s where s is the number of miles driven annually. What is the best car (combination of parameters) for a person who drives 12,000 miles every year