<p>If n distinct planes intersect in a line, and another line l intersects one of these planes in a single point, what is the least number of these n planes that l could intersect?</p>
<p>I'm stumped.</p>
<p>planes and lines all go to inifinity, there is no end, so unless the line is parallel to one of the planes, it has to intersect them all at some point, right? but i don’t know how you can tell from the information given, if line l is parallel to any of the lines.</p>
<p>I also need help with this one please</p>
<p>Which of the following has an element that is less than any other element in the set?
I. The set of positive rational numbers
II. The set of positive rational numbers r such that r^2 >or equal to 2
III. The set of positive rational numbers r such that r^2>4</p>
<p>huh? i don’t get it. basically, their just asking which set has a “smallest” element, right? don’t all of those sets have a “smallest” element? what kind of set doesn’t have a “smallest” element? I don’t think i really get the question oO</p>
<p>or maybe the rational numbers doesn’t have a “smallest” number, cause you can always just add a zero. like 0,000001 is smaller than 0,00001. so just 2 and 3</p>
<p>The answer is none for that problem. idk why though.</p>
<p>oh right, i overlooked the “rational” in answers 2 and 3 ^^
same thing here: you can always add a zero to make it smaller.</p>
<p>OK, I understand that concept of rational #s after some research. Thanks. Still need help with the first problem though. Any helpers please? (I’m having trouble visualizing this problem)</p>
<p>if that is on math 2 tomorrow, ill just leave. where are those from? i was just feeling good because I got an easy 800 on the official study guide book from college board.</p>
<p>Can someone answer me this? Is the Princeton math 2 test easier or harder? O just can’t seem to finish the thing. Anyone else have a problem with time? What to do? I am so nervous now!</p>
<p>I was pretty sure it was easier :/. I didn’t use them though, that’s just what i’ve heard of a lot of pr books</p>
<p>The answer to the OP is infinite.</p>
<p>H well seems like I’m in problems then. 
this is so frustrating for me!</p>
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<p>The answer is n-1. Since it’s asking for the least possible, we can assume that only one is parallel to the line, and therefore out of n planes, all of them but 1 intersect with it. This is represented by ‘n-1’</p>
<p>Here’s a quick brush up: <a href=“http://talk.collegeconfidential.com/sat-subject-tests-preparation/972152-schoolisfuns-sat-mathematics-level-ii-guide.html?highlight=Schoolisfun’s+SAT+Mathematics[/url]”>http://talk.collegeconfidential.com/sat-subject-tests-preparation/972152-schoolisfuns-sat-mathematics-level-ii-guide.html?highlight=Schoolisfun’s+SAT+Mathematics</a></p>