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Digital SAT
Digital SAT Mathematics - Calculator Section

Last Day Cookies Sold Equal 60

Hard Functions And Modeling Linear, Quadratic, And Exponential Models

A bakery sells cookies that are made fresh each day. The number of cookies, $C$, sold on a given day can be modeled by the function:

$$C(t) = -2t^2 + 16t + 20$$

where $t$ is the number of days since the beginning of the month. Determine the last day of the month when the number of cookies sold will equal 60. Provide your answer as a decimal number in the grid below.

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