Question

Describe the domain and range of the function.

f(x, y) = ln(xy − 10)

Domain:

(x, y): x > 10, y > 10

(x, y): x is any real number, y is any real number

(x, y): xy ≠ 10

(x, y): xy > 10

(x, y): xy ≥ 10

Range:

all real numbers

z ≥ 0

z ≠ 0

z > 0

z ≥ 1

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