Estimate the Extreme Values of the Function $$y ( x ) = \frac { 1 } { 3 } x ^ { 3 } - 7 x ^ { 2 } + 40 x + 15$$

Short Answer

Estimate the extreme values of the function. Round the answers to the nearest hundredth.
$$y ( x ) = \frac { 1 } { 3 } x ^ { 3 } - 7 x ^ { 2 } + 40 x + 15$$