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QUESTION 4 1 points Save An Solve the problem. The number of cows that can graze on a ranch is approximated by C(xy) = 9x + 5y -S, where x is the number of acres of grass and y the number of acres of alfalfa. If the ranch has 20 acres of alfalfa and 80 acres of grass, how many cows may graze? 572 cows 812 cows 580 cows 820 cows QUESTION 5 1 points Save An Evaluate. 4x3ex- dx Oe 4e 40- 1 Oe-1 Save All Answers Save and S Click Save and Submit to save and submit. Click Save All Answers to save all answers