Question

What is the domain of the function in the graph?

Answer 1

Answer: Choice B)
`7 \le r \le 12`

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Step-by-step explanation:

The domain is the set of allowed x inputs of a function.

How far to the left can we go on this red line? That would be x = 7.

How far to the right? That would be x = 12.

We can have x equal anything between 7 and 12, including both endpoints. We include the endpoints because they are filled in circles (as opposed to open holes).

So the domain is
`7 \le x \le 12`. If we replace x with r, then we update that inequality into
`7 \le r \le 12`. This replacement happens because r is along the horizontal x axis.

Answer 2

7≤r≤12

Step-by-step explanation:

The domain is the values that the input takes

The input goes from 7 to 12

7≤r≤12