The relationship between training costs $(x)$ and productivity $(y)$ is given by the following formula, $y=2x+4x^2+21.$

a$.$ Will Nonlinear Solver be guaranteed to identify the level of training that maximizes productivity?

No

Yes

b$.$ If training is set to $5,$ what will be the resulting level of productivity?

Note: Round your answer to the nearest whole number.

Level of productivity