plz solve in details Qno5 nd 6 . thanks

5. Solano Carriers finds that its monthly revenue, in dollars, from the sale of x carry-on suitcases is R(x) = 0.007x3 - 0.5x2 + 150x. Currently Solano is selling 26 carry-on suitcases monthly. a. What is the current monthly revenue? b. What is the marginal revenue when 26 suitcases are sold? c. Use your answers in (a) and (b) to estimate the revenue resulting from selling 27 suitcases per month. 6. Differentiate implicitly to find dy/dx. Then find the slope of te curve at the given point. xy + yz - 2x =0; (1, -2)