help ! work needs to be shown on both (both, all three, however you’d like to refer it as)

Answer:
13. 89%
14. 1/10 to each friend
Step-by-step explanation:
13. 89/100 = 0.89 -> 89%
100%/10 friends = 10% per friend, so 1/10 of the cake goes to each friend.
Fredrick can use decims as 0.1, as 0.1 of the cake goes to each friend.