Answer:
B
Step-by-step explanation:
This is pretty easy because you'll only have one variable.
First draw a box and label your width as 12 cm, your length as 2w (because it is twice the length of the width), and your height as 2w+10(beacuse it twice the width{2w} plus 10cm)
Then, substitute 'w' for the widths measurement(12)
So, 2w becomes 2 x 12 or 24cm and 2w+10 becomes (2 x 12) +10 or 24+10 which is 34 cm
then just simply use the volume formula of a box which is V=lwh or length x width x height, so its 12 x 24 x 34 which equals 9,792 cm^3
