Solve by elimination.x - y = x + y = - 

A.
B.
C.
D.

Answer: D

Mathematics

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Custom Office makes a line of executive desks. It is estimated that the total cost for making x units of their Senior Executive model is , dollars/year.

? 
Find the average cost function C.
? 
Find the marginal average cost function .
? 

A. , 
B. , 
C. , 
D. , 

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Mathematics

Provide an appropriate response.If the point (a, b) is in the fourth quadrant, in what quadrant is (-a, -b)?

A. IV B. II C. I D. III

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Simplify.9 + 25 ? 5 + 3

A. 173 B. 42 C. 137 D. 272

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Mathematics

Find the requested function value of ?.If sin ? = , find sec ?.

A.
B.
C.
D.

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Mathematics