Janet is selling lampshades at a craft fair. the price per lampshade in dollars f(x), and it is a function of x, the number of lampshades bought, what is the total cost of buying 10 lampshades from Janets stall.

Marquise has 200 meters of fencing to build a rectangular garden. the garden's area (in square meters) as a function of the garden's width w w (in meters) is modeled by: a ( w ) = − w 2 + 1 0 0 w a(w)=−w 2 +100w what side width will produce the maximum garden area? meters