The one above me was correct just did it^^
Answer:

Step-by-step explanation:
First, we need to know the number of player that don't stretch and the number of player that don't stretch and get injured.
So, the number of player that don't stretch are calculated as:
28 - 21 = 7
Because there are 28 footballers and 21 stretch regularly.
Additionally, the number of player that don't stretch and get injured are equal to:
8 - 3 = 5
Because there are 8 injured players and 3 of them stretch.
Finally, the fraction of players who don't stretch that get injured are:

Because there are 7 players that don't stretch and 5 of them get injured last year.
First, you convert 2 3/4 to a improper fraction, which is 11/4. Then you multiply 4/5 with 11/4, after you cross simplify the fractions, you can multiply 1/5 with 11/1, which equals 2 1/5. Hope can help you a little bit. :)
5 is the distance between the points which is given