Question

Please help.
Is algebra.
PLEASE HELP NO LINKS OR FILES.
I don't want links.

Answer 1

Answer:

$3d^3$

Step-by-step explanation:

The contents of the box must make

$7d^3 - \text{ BOX } = 4d^3$

To get $7d^3$ down to $4d^3$, you have to subtract $3d^3$