I'll give brainy for two correct math questions

Hello there,

So the first thing that we would want to do it to multiply each number that is shown in the first little cube on top. 

First top little cube shows: 5*5*5 and this would equal 125.

The Bottom Big Cube: This show's 15*15*15, and it would equal you: 3375.

So the last thing we would want to do is add the top cube and the lower cube together.

   3375
+125


3500

Hope this helps. :)

Hmm i believe it would be c