SAT Practice Test - Math - Modulus Function

SAT practice tests arranged by topic and difficulty level. In this section find tips and tactics for solving questions that focus on Modulus Functions.

Learn about Modulus Function

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SAT Practice Test 2015. Which of the following equations has a graph in the xy-plane for which y is always greater than or equal to -1?
A) $y=|x|-2$
B) $y=x^2-2$
C) $y=(x-2)^2$
D) $y=x^3-2$

Answer:

Choice A and B are wrong, because for x=0, y=-2
Choice C is correct, because $y\geq0$, for any value of x.
Choice D is wrong, because y can take any value.

Answer: C

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SAT Practice Test 2015. For what value of n is $|n-1|+1$ equal to 0?
A) 0
B) 1
C) 2
D) There is no such value of n.

Answer:

$|n-1|+1=0$
$|n-1|=-1$

The modulus of any number gives us the magnitude of that number. Therefore the modulus is always positive.

Answer: D

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