Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = ln (3x + 9y)
A. Domain: all points in the xy-plane satisfying 3x + 9y > 0; range: real numbers z ? 0; level curves: lines 
B. Domain: all points in the xy-plane; range: all real numbers; level curves: lines 
C. Domain: all points in the xy-plane satisfying 3x + 9y ? 0; range: all real numbers; level curves: lines 
D. Domain: all points in the xy-plane satisfying 3x + 9y > 0; range: all real numbers; level curves: lines 
Answer: D
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Write the requested fraction in lowest terms.20 hours is what fraction of a day?
A. 
B. 
C. 
D. 
Use a graphing utility to find the sum of the geometric sequence. Round answer to two decimal places, if necessary.-5 - 15 - 45 - 135 - 405 - ... - 5 ? 310
A. -442,828 B. -442,863 C. -442,865 D. -442,885
Perform the operation indicated. Simplify.
+ 
A. 
B. 
C. 
D. 