As Part of His Job as Cost Analyst,Max Thompson Collected

As part of his job as cost analyst,Max Thompson collected the following information concerning the operations of the Machining Department:
$$\begin{array} { l c c } \text { Observation } & \text { Machine-hours } & \text { Total Operating Costs } \\\text { January } & 4000 & \$ 45000 \\\text { February } & 4600 & 49500 \\\text { March } & 3800 & 45750 \\\text { April } & 4400 & 48000 \\\text { May } & 4500 & 49800\end{array}$$
Required:
a.Use the high-low method to determine the estimating cost function with machine-hours as the cost driver.
b.If June's estimated machine-hours total 4200,what are the total estimated costs of the Machining Department?
_____________________________________________________________________________________________
_____________________________________________________________________________________________