Find the sum.-17 + 7
A. -24
B. -10
C. 10
D. 24
Answer: B
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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 
Express the number as the ratio of two integers.0.444444 . . .
A. 
B. 
C. 
D. 
Rationalize the denominator and simplify. Assume that all variables represent positive real numbers.
A. - 
B. 
C. - 
D. 
Write the expression using exponents.
?
?
A. 
B. ?
C. ?
D. ?