BB 2nd Ed. Math Questions

Test Preparation SAT Preparation
1

<p>Was hoping to get some explanations for a few math questions in the Blue Book 2nd Ed. (10 tests). These questions are for the first practice test.</p>

<p>Section 3:
P. 401 #19, 20
19. You would need the book to answer this one. It has a drawing of a pyramid, and I can't figure out why the answer is A.</p>

<ol>
<li>A salesperson's commission is k percent of the selling price of a car. Which of the following represents the commission, in dollars, on 2 cars that sold for $14,000 each?</li>
</ol>

<p>A. 280k
B. 7,000k
C. 28,000k
D. 14,000/100+2k
E. 28,000+k/100</p>

<p>The answer is A.</p>

<p>Section 7:
P. 418 #18 (Free Response)
18. Picture of an upward-facing parabola with vertex at (0,-4).
The graph above shows the function g, where g(x)=k(x+3)(x-3) for some constant k. If g(a-1.2)=0 and a>0, what is the value of a?</p>

<p>The answer is 4.2.</p>

<p>Any help for these would be appreciated.</p>

2

<ol>
<li><p>Draw a line from the right vertex (or any vertex) of the pyramid to the bottom of ‘h’
You will see that you now have a right triangle with m as the hypotenuse, and h and
mROOT(2)/2 as the legs. Applying Pythagorean Theorem (solve for h) to the triangle
will yield m/ROOT(2) as the correct answer.</p></li>
<li><p>(14,000 *k/100)2 = 280k</p></li>
<li><p>Parabola has zeroes at 3 and -3. => 4.2 - 1.2 = 3 so 4.2 is the answer.</p></li>
</ol>

3

<p>Thank you 10char</p>