Somebody please help me again

Angela rode his bike around a bike trail that was 1/4 of a mile long he rode his bike around the trail 8 * angelo says he wrote a total of 8/4 miles to russell says he's wrong and he actually and says that he actually wrote to my who is corrupt use words and trying to explain how you know.

How can you tell when x and y are not directly proportional?

Find the circumference of a pizza with a diameter of 10 inches round to the nearest tenth