C: B:
3 0
6 9
9 18
12 27
All you had to do was plug in the value for c or b and solve. You can tell this is most likely correct because you see patterns for both variables. C is going up by threes, while b is going up by nines.
10, 20w, 2w, and we are factors of 20w and 40wz
1 white bead 3 blue beads 1 white bead 3 blue beads 1 white bead 3 blue beads.... it just keeps going
ANSWER
The three expressions are

EXPLANATION
We were given the volume in cubic units to

If we factor 2, we get,

The expression in parenthesis is a difference of two squares. But you may not recognize it at first sight.

This further gives us.