Can I please get an explanation and answer for both question attached?

thank you in advance

A corporation has asked you to prepare some multiple regression equations to estimate the effect of variables on fuel economy. The data for this study are shown below, and the dependent variable is miles per gallon. Complete parts a and b. Miles 43.2 36.3 32.4 39.5 36.6 19.7 19.9 20.4 19.5 20.9 Horsepower 49 69 52 70 61 108 143 139 104 94 Weight 1990 1880 2000 2095 1900 3360 3765 3565 3180 2715 a. Prepare a regression equation that uses vehicle horsepower and vehicle weight as independent variables. Let x, be defined as horsepower and x2 be defined as weight. (Round to four decimal places as needed.)b. Prepare a second biased regression with vehicle weight not included. y =( )+( )X1 (Round to four decimal places as needed.)