Free SAT Test Questions

Question 1 of 1
Section: Math - Heart of Algebra
Topic: Functions
Difficulty level: Hard

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Which of the following is NOT true about the function $f(x)=20-\frac{1}{x}$? (Without calculator)

AFor $x>0$, the function is increasing
B$x=0$ will not lie in the domain on this function
CThe minimum value of the function is $-\infty$
DThe maximum value of the function is 20

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