please help with these calculus problems ... please show workings thanks..

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Evaluate | A| by expanding down the third column. 7 -3 -9 A= 4 0 -6 4 - 5 . . . IAl = ()A13+ ()A23 + ()As3 |Al = (Simplify your answer.)Graph the system of inequalities. Then nd the coordinates of the vertices. 4y - x 2 - 4 4y + x 2 - 12 y S 0 x S 0 Use the graphing tool on the right to graph the system of inequalities. Click to enlarge graph What are the vertices? (Type an ordered pair. Use a comma to separate answers as needed.) it" Graph the system of inequalities. Then nd the coordinates of the vertices. 6y x s 6 y + 7x 2 - 2 Use the graphing tool to graph the system. What are the vertioes? ID (Type an ordered pair. Type an integer or a simplied fraction. Use a comma to separate answers as needed.) An animal feed to be mixed from soybean meal and oats must contain at least 168 lb of protein, 27 lb of fat, and 14 lb of mineral ash. Each sack of soybeans costs $21 and contains 70 lb of protein, 9 lb of fat, and 7 lb of mineral ash. Each sack of cats costs $7 and contains 21 lb of protein, 7 lb of fat, and 1 lb of mineral ash. How many sacks of each should be used to satisfy the minimum requirements at minimum cost? What is the minimum cost? $ (Round to the nearest cent as needed.) How many sacks of each feed should be used to satisfy the minimum requirements at minimum cost? D sacks of soybean meal |:| sacks of oats (Simplify your answers. Type integers or fractions.) Find the maximum value and the minimum value of the function and the values of x and y for which they occur. P=16x-5y+66, subject to 7x+8y556, 05ys4, and 05x56. E) The maximum value of the function is I: and it occurs where x = D and y = D. The minimum value of the function is D and it occurs where x = D and y = D. (Do not round until the nal answer. Then round to two decimal places as needed.)