Question with a math problem.

Test Preparation SAT Preparation
1

<p><a href="http://i.imgur.com/bGmU6.png%5B/url%5D"&gt;http://i.imgur.com/bGmU6.png&lt;/a&gt;&lt;/p>

<p>How do I solve it!</p>

2

<p><a href=“C”>b</a>**</p>

<p>At 3:00 the depth was 20, because it needed to drop 10% (2 inches).</p>

3

<p>All right thanks.</p>

<p>How about this one?</p>

<p><a href=“http://i.imgur.com/NIe7R.png[/url]”>http://i.imgur.com/NIe7R.png&lt;/a&gt;
Answer is 89. How do you do it?</p>

4

<p>One last one:
<a href=“http://i.imgur.com/FJfrR.png[/url]”>http://i.imgur.com/FJfrR.png&lt;/a&gt;
Answer is E. I can kinda see why but I want a firmer understanding of it.</p>

5

<p>For the 2-digit number: don’t work too hard at it; there aren’t that many possible 2-digit numbers.</p>

<p>n/10 has a remainder of 9. This means the ones digit is 9. The only possible choices are 19, 29, 39, 49, 59, 69, 79, 89, 99.</p>

<p>n/9 has a remainder of 8. The only one that works is 89.</p>

6

<p>For the cube: if the sphere with radius r touches each side of the cube, then the length of a side of the cube is equal to the diameter of the sphere–that is, 2r.</p>

<p>The volume of the cube is (2r)^3, or 8r^3. (V = s^3. Since s = 2r, V = (2r)^3.)</p>

7

<p>Oh wow. Thanks :D. Now I get it.</p>