Answer:
169
Step-by-step explanation:
if S(n)=n^2
so,S(13)=13^2
n=13
n^2=13^2
=169
I believe the answer is B.Good luck!
6/10 - 1 = -0.4 = -40%
A decrease of 40%.
90+ 135= 225
a can be found with formula (n-2)×180/n, where n is number of sides
a= 135
b=90
