What is the rate of speed in miles per hour?

A 0.2
B 12.5
C 25
D 50

If a and b are the measures of two first quadrant angles and sin a = 4/9 and sin b = 2/5 find sin(a+b).

Asequence {an} is defined recursively, with a1 = 1, a2 = 2 and, for n > 2, an = an-1 an-2 . find the term a241. a) 0 b) 1 c) 2 d) 1 2

For which pair of functions is (gof)(a)=|a|-2?