Halp its due today and somehow im struggling and this is week 3

Try to look for the pattern.

As you can see on the first column, the last three numbers line up by +3 (12 to 15 to 18). Proof - 12 + 3 = 15 + 3 = 18.

So you go back by subtracting 3. 12 - 3 = 9 - 3 = 6 - 3 = 3

For the other column, the pattern is +17. Proof -   51 - 34 = 17, 102 - 85 = 17.

So do the same thing as in the first column.

Results:

3                 17

6                 34

9                 51

12                68

15                85

18                102

(a) the volume of the cone is 20/3 in3

hence, option a is correct.