Solve the problem.The data below represent the average monthly cost of natural gas in an Oregon home.   Above is the graph of 45.05 sin x superimposed over a scatter diagram of the data. Find the sinusoidal function of the form  which best fits the data.

A. y = 45.05 sin  + 21.20
B. y = 45.05 sin  + 21.20
C. y = 45.05 sin  + 66.25
D. y = 45.05 sin  + 66.25


Answer: D

Mathematics

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A. ?y = 4x
B. ?3x + y = 8
C. ?

InputOutput
18
216
324

D. ?
InputOutput
–31
–22
04

E. ?y = x2

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A. {(-7, 0), (-7, 7)} B. {(7, 7), (-7, 7)} C. {(7, 0), (7, 7)} D. {(7, 0), (-7, 0)}

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Answer the question.If the graphs of a system of two equations are both parabolas, what are the possible numbers of solutions (with real coordinates) of this system?

Fill in the blank(s) with the appropriate word(s).

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Convert to an expression using radical notation.(x2 - 5)-1/2

A.
B. - 
C.
D.

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