Please help and show work... need fast . college algebra The revenue, R(x), of producing and selling x Awesome Hearing Aids is modeled by the function R(x)=−4x^2+56x How many hearing aids need to be produced and sold in order to maximize the revenue? (Round to the nearest whole number.) The revenue is at a maximum after hearing aids are produced and sold. What is the revenue? (Round answer to the nearest cent.) The maximum revenue is $ .