Below are cost and activity data for a particular cost over the last four periods. Your boss has asked you to analyze this cost so that management will have a better understanding of how this cost changes in response to changes in activity.

	Activity		Cost
Period 1	46		$	791
Period 2	40		$	738
Period 3	47		$	807
Period 4	41		$	746

Required:

Using the least-squares regression method, estimate the cost formula for this cost.