Solve the problem using matrices.The nutritional content per ounce for three foods is given in the table below.
What combination of these foods can provide exactly 14 grams of fat, 27 grams of protein, and 10 grams of fiber?
A. 3 oz of Food A; 5 oz of Food B; 1 oz of Food C
B. 4 oz of Food A; 6 oz of Food B; 2 oz of Food C
C. 7 oz of Food A; 7 oz of Food B; 1 oz of Food C
D. No possible combination of these foods
Answer: D
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A. Circle centered at origin with radius 13 B. Horizontal line through (0, 13) C. Line with slope 13 passing through the origin D. Vertical line through (13, 0)
Solve the problem.A rescue cable attached to a helicopter weighs 2 lb/ft. A 160-lb man grabs the end of the rope and is pulled from the ocean into the helicopter. How much work is done in lifting the man if the helicopter is 30 ft above the water?
A. 4860 ft ? lb B. 5700 ft ? lb C. 1060 ft ? lb D. 6600 ft ? lb
Solve the problem.Does the graph of the function y = 4x + 2 sin x have any horizontal tangents in the interval 
If so, where?
A. Yes, at x = 
B. Yes, at x = 
, x = 
C. No
D. Yes, at x = 
, x = 
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A. (-7, 5), r = 9 B. (7, -5), r = 3 C. (5, -7), r = 9 D. (-5, 7), r = 3