Clough Company Is Interested in Establishing the Relationship Between Utility

Clough Company is interested in establishing the relationship between utility costs and machine hours. Data have been collected and a regression analysis prepared using Excel. The monthly data and the regression output follow:
$\begin{array}{llll}&&\text { Utility } \\\text { Month } & \text { Machine Hours } & \text { Costs }\\\text { January } & 3,250& \$ 2,080 \\\text { February } & 3,77 0 & 25,200 \\\text { March } & 2,470 & 16,200 \\\text { April } & 4,030 & 27,600 \\\text { May } & 4,940 & 33,900 \\\text { June } & 4,290 & 26,400 \\\text { July } & 5,330 & 29,700 \\\text { August } & 4,550 & 27,300 \\\text { September } & 2,600 & 18,600 \\\text { October } & 4,810 & 31,200 \\\text { November } & 6,110 & 37,200 \\\text { December } & 5,460& 33,300\end{array}$


Required:
(a.) What is the equation for utility costs using the high-low method?
(b.) Prepare an estimate of utility costs for a month when 3,000 machine hours are worked.