The answer is 72 (--> second choice).
I can prove it without calculator so you believe me:

1. this is a series of squares Formula is an = n^2
2. Arithmetic series with common difference d = -2.
an = a1 + (n-1)d = 3 -2(n-1)
Cant see the rule for Number 3
Answer:
6b
Step-by-step explanation:
|-b| = b
b+5b= 6b
Honestly no idea... sorry