please help me understand so i may help my daughter with her hw

Solve the system of equations. x2yz = 6 x+6y3z = 18 2x11y+5z = 33 Select the correct choice below and ll in any answer boxes within your choice. 0 A- There is one solution. The solution is [ , , ). (Type exact answers in simplied form.) , .2] . O 3- There are innitely many solutions. The solutions are ( where z is any real number (Type exact answers in simplied form.) 0 C. There is no solution. One 802 serving each of coffee, energy drink, and soda contains 198 mg of caffeine. One serving of coffee has 7 mg more caffeine than two servings of soda. One serving of energy drink contains 38 mg less caffeine than one serving each of coffee and soda. Find the amount of caffeine in one serving of each beverage. The amount of caffeine in one serving of coffee is mg, in one serving of energy drink is mg, and in one serving of soda is mg. (Type whole numbers.) A dietician works in a hospital and prepares meals under the guidance of a physician. Suppose that for a particular patient, a physician prescribes a meal to have 450 calories, 30 g of protein, and 120 mg of vitamin C. The dietician decides to prepare the meal using steak (each 3~oz serving contains 300 Cal, 20 g of protein, and no vitamin C), baked potatoes (one baked potato contains 100 Cal, 5 g of protein, and 20 mg of vitamin C), and Brussels sprouts (one 1569 serving contains 50 Cal, 5 g of protein, and 100 mg of vitamin C). How many servings of each food are required to satisfy the physician's requirements? How many servings of steak are required? How many baked potatoes are required? How many servings of Brussels sprouts are required