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13. About 36 floors

14. Remove or add 4 block

15. D

Step-by-step explanation:

13. 509/14 = 36.35714286

14. The horizontal one has dimensions:

5 × 2 × 2

The vertical one has dimensions:

2 × 2 × 4

To make the volumes equal:

1) remove 4 blocks from the horizontal one

Or,

2) add 4 block in the vertical one

15.

Volume of Model Q:

T × 2 × 3 = 30 in³

Volume of model R:

4 × 3 × 2 = 24 in³

Combined volume:

30 + 24 = 54 in³

step-by-step explanation:

it's is b