<p>p. 869 </p>
<p>[DIAGRAM]</p>
<li>The figure above shows the dimensions of a pedestal constructed of 4 layers of marble. Each layer is a rectangular solid that is 1 foot high and has a square base. How many cubic feet of marble make up the pedestal?</li>
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<p>Thanks.</p>
<p>Well, each 1x1x1 block is 1 cubic foot. You just count up how many there are:
1 + 4 + 9 + 16 = 30</p>
<p>Wait, I don’t get it. So the first cubic block is 1, but what makes the ones below it 4, 9, and 16?</p>
<p>The highest level is 1x1 right?</p>
<p>And the ones under it are 2x2, 3x3, 4x4.</p>