SOMEONE PLEASE HELP ME THIS IS ALMOST DUE AND I NEED THE RIGHT ANSWER PLZ!!!

Answer: 9
Step-by-step explanation:
super easy
basically do 15-5 which is 10
thats the hypotenuse side
now apply pythegorean theorem: 5 squared + x squared= 10 squared
25+ x squared=100
x squared=75
x approxiametly equals 9