ActivLife Incorporated determines that the revenue generated by producing and selling x of their LifeMax ellipticals can be modeled by the function

R(x) = x^2/18+ 180xx 0

where x represents the number of ellipticals produced and sold, and R(x) represents the revenue in dollars. Determine m_sec on the closed interval [8, 20].

(Round your answer to two decimal places.)

m_sec =

Interpret the result.The revenue generated by producing and selling the LifeMax elliptical is increasing on average by approximately $ 2