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 
+ 66.25
B. y = 45.05 sin 
+ 21.20
C. y = 45.05 sin 
+ 21.20
D. y = 45.05 sin 
+ 66.25
Answer: D
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Find an equivalent equation in polar coordinates.x2 + 4y2 = 4
A. r2(cos2? + 4 sin2?) = 4 B. cos2? + 4 sin2? = 4r C. 4 cos2? + sin2? = 4r D. r2(4 cos2? + sin2?) = 4
Find an equation in slope-intercept form for the nonvertical lines. Write the vertical lines in the form x = h.Passing through (7, 2) and (-7, 2)
A. y = 10x - 78 B. y = 2 C. y = 2x - 22 D. y = 5x - 43
Find the coordinates of the vertex for the parabola defined by the given quadratic function.f(x) = 11(x - 5)2 + 9
A. (5, 9) B. (11, 5) C. (9, -5) D. (-5, 9)
Solve by any method. If there is not one solution to a system, state why. x + 5y = -164x + 4y = 0
A. (3, -3) B. (-4, -3) C. (4, -4) D. (3, -4)