Answer:
I don't know the answer but I have a suggestion, have you tried using 900gle lens app putting it on homework setting then scanning it for the answer
Answer: 
Step-by-step explanation:
x^2+y^2=r^2 --> subtract x^2 to other side
y^2=r^2-x^2 --> square root both sides
y=sqrt(r^2-x^2)
The answer is 5! Like if you have 3 cookies then add two you would have .. 5! (: any other questions you need help with?