a) The least-squares regression equation that shows the best relationship between sales tax (in millions) and car registrations (in thousands) is (round your responses to three decimal places and include a minus sign if necessary): y^=+x. where y^= Dependent Variable and x= independent Variable. b) Using the least-squares regression equation, the estimated sales tax collection when the new number of registrations total is 22,000={ million (round your response to two decimal places). c) The coefficient of correlation for the least-squares regression = (round yeur response to four decimal places). The coeflicient of determination for the least-squares regression = (round your mesponse to four decimal places)