6. Show the calculation of the EXACT AREA using basic plane geometry (this problem references an area that is either a triangle or trapezoid, so you can use the corresponding formula - I am NOT looking for an integral here). Please include an accurate sketch of the region in the space below (your x & y axes do not have to use the same scale). A note card company has found that the marginal cost per card of producing x note cards is given by the function below, where C'(x) is the marginal cost, in cents, per card. Find the total cost of producing 720 cards, disregarding any fixed costs. C'(x) =-0.03x + 79, for x $ 1000