To calculate the circumference of a circle, you can use the formula:
\[ C = 2 \pi r \]
where \(C\) is the circumference and \(r\) is the radius. Given that the radius \(r\) is 2.5 feet and using \( \pi \approx 3.14\):
\[ C = 2 \times 3.14 \times 2.5 \]
First, calculate \(2 \times 2.5\):
\[ 2 \times 2.5 = 5 \]
Now, multiply this by \(3.14\):
\[ C = 5 \times 3.14 = 15.7 \]
So the estimated circumference of the circle is \(15.7\) feet, rounded to the tenths place.