Question

the table represents a function.
select all of the values that are in the domain:

x	y
7	9
9	9
12	10
21	9

show your work here
□ 7 □ 9
□ 10 □ 12
□ 21

Explanation:

Step1: Recall domain definition

The domain of a function is the set of all input values (x - values) for which the function is defined.

Step2: Identify x - values from the table

From the given table, the x - values (input values) are 7, 9, 12, and 21. The y - values (10, 9) are the range (output values), not the domain. So we check which of the given options are x - values.

• 7: It is an x - value, so it is in the domain.
• 9: It is an x - value, so it is in the domain.
• 10: It is a y - value, not in the domain.
• 12: It is an x - value, so it is in the domain.
• 21: It is an x - value, so it is in the domain.

Answer:

7, 9, 12, 21 (the checkboxes for 7, 9, 12, and 21 should be selected)