Find the shaded region in the graph. The area of the shaded region is . (Simplify your answer, including any radicals. Use integers or fractions for 1;: any numbers in the expression. Type an exact answer in terms 0hr.) 1:13 do The marginal cost of printing a poster when x posters have been printed is 7 = 1 dx 21/; dollars. Find C(81} C(16), the cost of printing posters 17-81. The cost of printing posters 17-81 is dollars. (Simplify your answer.)