Question

Which of the following is a perfect square?
A. 20
B. 400
C. 200
D. 40

Answer 1

Among the given options, option B. 400 is a perfect square because it is the result of 20 multiplied by itself.

Step-by-step explanation:

To determine which of the given options is a perfect square, we need to find a number that is the square of an integer. The options given are:

• A. 20
• B. 400
• C. 200
• D. 40

Now, let's review each option:

• 20 is not a perfect square because you cannot find an integer that when squared gives 20.
• 400 is a perfect square because 20 times 20 is 400.
• 200 is not a perfect square for the same reason as 20; there isn't an integer that, when squared, equals 200.
• 40, again, is not a perfect square since no integer squared equals 40.

Therefore, the correct answer is B. 400, which is a perfect square.