Solve the system by substitution.x + y = -9x - y = 18
A. {(4.5, -13.5)}
B. {(9, -13.5)}
C. {(4.5, 13.5)}
D. {(9, 4.5)}
Answer: A
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Solve the problem.Behemoth Back Packs, Inc. finds that the cost to make x back packs is 
while the revenue produced from them is 
(C and R are in dollars). What is the smallest whole number of back packs, x, that must be sold for the company to show a profit?
A. 405,592 B. 77,096 C. 28 D. 146
Solve the problem.Assume that the mathematical model C(x) = 19x + 170 represents the cost C, in hundreds of dollars, for a certain manufacturer to produce x items. How many items x can be manufactured if the cost is to be kept between $739,000 and $1,100,000?
A. {x 
570 < x < 760}
B. {x 
600 < x < 800}
C. {x 
380 < x < 570}
D. {x 
400 < x < 600}
True or false?"You win if your card contains the number 23 or the number 45" is an example of union applied to a real-life situation.
A. True B. False
Find the quotient using long division.
A. 3x2 - 5x - 5 B. x2 + 5x + 5 C. 3x2 - 5 D. x2 - 5x - 5