Given 
, find 
.
Fill in the blank(s) with the appropriate word(s).
–2
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Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = ln (6x + 6y)
A. Domain: all points in the xy-plane satisfying 6x + 6y > 0; range: real numbers z ? 0; level curves: lines 
B. Domain: all points in the xy-plane satisfying 6x + 6y > 0; range: all real numbers; level curves: lines 
C. Domain: all points in the xy-plane; range: all real numbers; level curves: lines 
D. Domain: all points in the xy-plane satisfying 6x + 6y ? 0; range: all real numbers; level curves: lines 
Is the function graphed below one-to-one?
A. Yes B. No
Find the center of mass of a thin plate of constant density covering the given region.The region bounded by the x-axis and the semicircle y = 
A. 
= 
, 
= 0
B. 
= 
, 
= 
C. 
= 0, 
= 
D. 
= 0, 
= 
Answer the question.How many 11 letter strings can be formed with the letters D , E , F , and G , if each letter can be used more than once?
A. 4,194,264 B. 4,194,504 C. 4,194,384 D. 4,194,304