Determine whether the rule defines y as a function of x.XY 

A. Function
B. Not a function

Answer: A

Mathematics

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Find the exact value under the given conditions.cos ? = - ,   < ? < ?; sin ? = - , ? < ? < Find cos (? + ?).

A.
B.
C.
D.

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Multiply.2

A. 81x2 - 
B. 81x2 - x - 
C. x2 - 2x + 81 
D. x2 + 2x - 81

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Multiply.(x + y - 9)(x + y + 9)

A. x2 + y2 + 2xy + 81 B. x2 + y2 - 81 C. x2 + y2 + 2xy - 81 D. x2 + y2 + 2(xy - 9)

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Solve the problem.A formula for the focal length of a lens is f = . Calculate f (the focal length) for a = 6 cm and b = 8 cm. Round to the nearest tenth of a centimeter, if necessary.

A. 3.0 cm B. 2.6 cm C. 3.4 cm D. 4.0 cm

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