Use polar coordinates to find the limit of the function as (x, y) approaches (0, 0).f(x, y) = cos
A. 0
B. 
C. 1
D. No limit
Answer: D
Mathematics
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For the given rectangular equation, write an equivalent polar equation.y = x
A. r = cos ?
B. sin ? = - cos ?
C. r = sin ?
D. ? = 
Mathematics
Use the integral test to determine whether the series converges.
A. converges B. diverges
Mathematics
Determine whether the graph opens upward or downward.y = x2 - 5
A. Upward B. Downward
Mathematics
Determine whether the first variable varies directly or inversely with the other variable.The depth of a diver in the ocean, the pressure exerted by the water on the diver.
A. Inversely B. Directly
Mathematics