PSAT Math Help Thread

Test Preparation SAT Preparation
1

<p>Thought i would create a thread for some PSAT math questions people have trouble on, and we could help them with. I took last years PSAT and got 3 math questions wrong (well technically not all 3 wrong, because i omitted 2). Any help would be appreciated.</p>

<ol>
<li><p>If k^1/3 * k^1/3 * k^1/3 = 1 which of the following is equivalent to x^k ?
(a) 1
(b) k
(c) k^3
<a href="d">B</a> x<a href="e">/B</a> x^3</p></li>
<li><p>In the xy-plane, line m is the reflection of line l across the x-axis. If the intersection of lines l and m is the point (r,s), which of the following must be true?
(a) r=0
<a href="b">B</a> s=o<a href="c">/B</a> r=s
(d) r=-s
(e) rs = -1</p></li>
<li><p>In the xy-coordinate system, a circle has a center C with the coordinates (6, 2.5). This circle has exactly one point in common with the x-axis. If the point (3.5, t) is also a point on the circle, what is the value of t?
A: 2.5</p></li>
</ol>

2

<ol>
<li>When you multiply exponential expressions with a common base, you add up the exponents. 1/3 + 1/3 + 1/3 = 1. k^1=1, so k=1.</li>
</ol>

3

<ol>
<li> If the lines are the result of an x-axis reflection, they must intersect at the x-axis. So, s=0.</li>
</ol>

4

<ol>
<li> Draw it out. The line x=3.5 is 2.5 from the vertical line drawn through the circle’s center. The radius is 2.5, so the exterior point must be a radial distance away. Therefore, the y is unchanged.</li>
</ol>

5

<ol>
<li> You could also use the distance formula and solve for t.</li>
</ol>

6

<p>thanks silverturtle! what did you get on your SAT total and SAT math?</p>

7

<p>As a freshman, I got a 790 on the SAT Math. I haven’t yet taken it again. </p>

<p>However, I have the PSAT on Wednesday, but I took the practice test from the Student Guide yesterday and got a 240.</p>

8

<p>^ you are what CC is all about =P</p>

<p>meanwhile, i’ll try breaking a 200 or 2000 =)</p>