[Solved] The method of least squares was used to develop a cost equation to predict the cost of monthly equipment maintenance for the Regina Company. The following computer output was received: The driver used was the number of machine hours. \(\begin{array}{lr} \text { Intercept } & 32,000 \\ \text { Slope } & 25 \end{array}\) -Refer to the Figure.What is the independent variable of the cost formula for equipment maintenance? A)number of machine hours B)the variable rate C)the fixed cost D)the total cost Focus Controls: Elements in software or optical devices designed to adjust the clarity and sharpness of an image or to direct attention to specific tasks. Clear View: A term denoting an unobstructed and clear line of sight or understanding. Proper Objective: An aim or goal that is suitable and appropriately targeted for a specific task or endeavor. Optical Microscopes: Instruments that use visible light and a system of lenses to magnify small objects, allowing for the observation of details not visible to the naked eye.