What does it mean when you need to graph a piecewise function where f(x) =0 if x is not an integer

example in the attached photo

Circle a has a diameter of 7 inches, a circumference of 21.98 inches, and an area of 38.465 square inches. the diameter of circle b is 6 inches, the circumference is 18.84 inches, and the area is 28.26 square inches. part a: using the formula for circumference, solve for the value of pi for each circle. (4 points) part b: use the formula for area and solve for the value of pi for each circle. (4 points)

What is the the greatest common factor ?

How many square centimeters of wrapping paper will be used to wrap the shoe box?