<p>I've been encountering a lot of questions that provide a graph and then ask you to choose its equation. I know the leading exponent is at least (N+1), where "N" is the number of extreme points on the graph. But what about the coefficients? How can they be interpreted?</p>
<p>Also, when do I use nPr and when do I use nCr?</p>
<p>Thanks.</p>
<p>nPr=permutations (order matters)
nCr=combinations (order doesn’t matter)</p>
<p>If you need a little more of an explanation for the difference, it’s like having a red, yellow, blue, & green marker (RYBG abbreviated.) RYBG, YGRB, RYGB, etc. are all permutations.</p>
<p>Combinations would just be like picking two markers from those four. If you pick a red and then a yellow marker, it’s the same as picking a yellow and then a red marker.</p>
<p>If you have a graphing calculator, you can simply plug in the answers and the given window and match the graph to the correct one that’s given.</p>