What is the exact length of arc AB ?

4 π m
6 π m
8 π m
12 π m

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

Asequence {an} is defined recursively, with a1 = 1, a2 = 2 and, for n > 2, an = an-1 an-2 . find the term a241

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)