Exhibit 16-1.The following Excel scatterplot with the fitted quadratic regression equation illustrates the observed relationship between productivity and the number of hired workers. 
Refer to Exhibit 16.1.For which value of Hires the predicted Productivity is maximized (Do not round to the nearest integer. ) ?
Definitions:
W-3
A tax form used in the United States to summarize the total wages paid and taxes withheld for employees to the Social Security Administration.
Federal Unemployment Tax Return
A tax return specifically for reporting the amount of federal unemployment tax a business is responsible for paying, related to the wages paid to employees.
Form 940
An IRS form used by employers to report their annual Federal Unemployment Tax Act (FUTA) tax.
Form 941
A federal tax form used by employers to report quarterly federal income tax withheld from employees' paychecks and FICA taxes.
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