Which one of these numbers is a perfect square? 21, 15, 6, 16, 27

I think it is 16.

Step-by-step explanation:

16

Step-by-step explanation:

Perfect squares are numbers that can be written as the product of a different number and itself: k * k = k^2.

Looking at the numbers:

21: can be written as 3 * 7, but not in the form k^2

15: can be written as 3 * 5, but not in the form k^2

6: can be written as 2 * 3, but not in the form k^2

16: can be written as 4 * 4, which is in the form of k^2

27: can be written as 3 * 9, but not in the form k^2

Thus, the answer is 16.

Hope this helps!

it is probably the graph on the bottom right.

right

step-by-step explanation: