This is just an example. There are many solutions to this problem.
You have to substitute y, x, the square root, and the pi.
Now, substitue y and x and the problem would look like this:
yx2√π=2∗3∗2√π
Now, substitute the square root.
2∗3∗2√4π
Now, solve the expression.
2∗3∗2√4π=12√4π=122π=18.8495559215387594
So, 18.8495559215387594 is the answer.
But, you would want to round that.
So, when you round that, the answer is 18.8.
Hope it helps!