Solve the problem.Let f(x,y) = ln (x2 + y2). Which one of the following curves is a simple closed path in the domain of the function f?
A. The unit circle x2 + y2 = 1
B. The ellipse 
+ 
= 1
C. The rectangle with vertices at (-3, 2), (3, 2), (3, -2), and (-3, -2)
D. The unit circle (x - 5)2 + y2 = 1
Answer: D
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A. 3 ways B. 5 ways C. 1 way D. 6 ways
Graph the parabola whose equation is given.f(x) = x2 - 1
A. 
B. 
C. 
D. 
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Fill in the blank(s) with the appropriate word(s).