Solve the problem by writing an appropriate system of equations and using the inverse of the coefficient matrix to solve the system.A grain dealer sold to one customer 5 bushels of wheat, 2 of corn, and 3 of rye, for $39.60; to another, 2 of wheat, 3 of corn, and 5 of rye, for $34.80; and to a third, 3 of wheat, 5 of corn, and 2 of rye, for $33.60. Which of the grains was the cheapest?
A. Wheat
B. Wheat and rye (tie)
C. Corn and rye (tie)
D. Corn
Answer: D
Mathematics
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Find the area of the region specified in polar coordinates.The region inside both 
and 
A. 16(? - 2) B. 8(? - 1) C. 8(? - 2) D. 16(? - 1)
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Decide whether the expression has been simplified correctly.x4 ? x2 = x6
A. Simplified correctly B. Not simplified correctly
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Find the slope of the line passing through the pair of points.
Fill in the blank(s) with the appropriate word(s).
Mathematics
Solve the problem.A map has a scale of 4 miles to the inch. How far apart in reality are two cities that are 20 inches apart on the map? How far apart on the map are two cities that, in reality, are 20 miles apart?
A. 80 miles; 5 inches B. 5 miles; 80 inches C. 5 miles; 5 inches D. 80 miles; 80 inches
Mathematics