An arch of a bridge is semi-elliptical, with major axis horizontal. The base of the arch is 30 feet across, and the highest part of the arch is 10 feet above the horizontal roadway, as shown in the figure. Find the height of the arch 7 feet from the center of the base. 
Definitions:
Direct Materials
Parts and raw materials of a product.
Variable Overhead
Costs that fluctuate with production levels, such as utilities or materials used in the manufacturing process.
Variable Costing
An accounting method that includes only variable manufacturing costs - direct materials, direct labor, and variable manufacturing overheads - in product costs.
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