Solve the system of equations by Gaussian elimination.
A. {(9, 8)}
B. {(8, 8)}
C. {(9, 7)}
D. ?
Answer: C
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Name the conic (horizontal ellipse, vertical hyperbola, and so on) corresponding to the given equation.
= 
A. Vertical parabola B. Horizontal hyperbola C. Horizontal parabola D. Vertical hyperbola
Solve the problem.Suppose c(x) = x3 - 20x2 + 20,000x is the cost of manufacturing x items. Find a production level that will minimize the average cost of making x items.
A. 11 items B. 10 items C. 9 items D. 12 items
Factor.2x2(x - 4) + 5(x - 4)
A. (2x2 + 5)(x - 4) B. (2x2 - 5)(x - 4) C. (2x2 + 5)(x + 4) D. (6x2 + 5)(x - 4)
Solve the problem.Anne and Nancy use a metal alloy that is 21.1% copper to make jewelry. How many ounces of an alloy that is 18% copper must be mixed with an alloy that is 25% copper to form 140 ounces of the desired alloy?
A. 67 oz B. 80 oz C. 62 oz D. 78 oz