The following Excel scatterplot with the fitted quadratic regression equation illustrates the observed relationship between productivity and the number of hired workers. 
What is the percentage of variations in the productivity explained by the number of hired workers?
Definitions:
Established
Something that has been in existence for a long time and is therefore recognized and accepted.
Administered
The act of managing or supervising the execution, use, or conduct of operations, laws, or policies.
Distal Convoluted Tubules
Tubes in the kidney where filtration, reabsorption, and secretion occur, resulting in the formation of urine.
Proximal Convoluted Tubules
The portion of the nephron in the kidney that is responsible for reabsorbing water, ions, and nutrients from the filtrate back into the blood.
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