Help plss i really need help with this

What's the difference between: x≥0 and nonnegative integer. ?

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.

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30