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The volume (V) is the product of base area (B) and height (h).

For Max's carton ...
  V = Bh
  V = (12 in²)*(6 in) = 72 in³

For Tucker's carton ...
  V = Bh
  V = (10 in²)*(7 in) = 70 in³

Max's carton has more volume than Tucker's carton by ...
  72 in³ -70 in³ = 2 in³

We know this because we computed the volume of each carton and found the difference of those volumes.

-11.4

Explanation:

Y+(-4.3). Y=-7.1
Y-4.3
-7.1-4.3 = -11.4