The following Excel scatterplot with the fitted quadratic regression equation illustrates the observed relationship between productivity and the number of hired workers. 
The quadratic regression equation found is _________.
Definitions:
Fixed Overhead Costs
Costs that do not vary with the level of production or sales, including rent, salaries, and insurance.
Standard Cost
A predetermined cost of manufacturing, storing, and selling a product, used as a benchmark to measure actual performance and budgeting.
Overhead Controllable Variance
The difference between the actual overhead costs incurred and the budgeted amounts that could be controlled or influenced by management.
Overhead Volume Variance
The difference between the budgeted overhead costs based on standard production volumes and the actual overhead costs incurred due to changes in production activity levels.
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