Functions Intro Quiz with Answers

Question 1

A relation is a function if each input has exactly one output. Which statement best describes a function?

Accepted Answer

Each input is paired with exactly one output.

Answer

Each output is paired with exactly one output.

Answer

Every output has exactly one input.

Answer

Each input is paired with at least two outputs.

Question 2

Suppose $f(2)=9$ and $f(5)=9$. Which statement is true?

Accepted Answer

This is a function because each input has exactly one output.

Answer

This cannot be a function because two inputs give the same output.

Answer

This is not a function because the output must be different each time.

Answer

This is not a function because the inputs are different.

Question 3

Consider the table:

$$
\begin{array}{c|c}
	ext{Input} & 	ext{Output}\ \hline
1 & 4\
2 & 6\
2 & 7\
3 & 8
\end{array}
$$
Is this a function?

Accepted Answer

No, because input $2$ has two different outputs.

Answer

No, because input $1$ is too small to be an input.

Answer

Yes, because each output is used only once.

Answer

Yes, because the outputs are increasing.

Trusted & Recognized