Answer:
Answer: -7
Step-by-step explanation:
By "density" I assume you mean "probability density function". For this to be the case for

, we require

Since

you have

which means
The radius is 2 yards...
Formula for circumference is

so divide your circumference by 3.14 or pi and you get 4 the square root of 4 is 2.
Hope this helps!