22, i think because 3 times 3= 9, and 9 times 3 minus 5= 22
Formula used: cos(x) = 
Hope this helped!
~Just a girl in love with Shawn Mendes
I is the right one because it is a half and they both look the same
Answer:
45
Step-by-step explanation:
n/15=30
therefore n=450
hence n/10 = 45