<p>I think we should make a list of random math topics to review before the ACT, because you’ve seen a question on it. I don’t mean topics that there are multiple questions on, like circles, functions, and algebra, but things that don’t come up a lot but could during the test. For example, I saw one question on even/odd functions, and one on shape reflections. </p>
<p>Add on stuff you’ve seen.</p>
<p>[P=>Q] <=> [~Q=>~P]</p>
<p>a.k.a. say this statement is true:
If do poorly on my ACT, then I will rip up my score report.
then “flip and negate”
If I don’t rip up my score report, then I didn’t do poorly on my ACT.
in math terms, the two statements have the same “truth value.” This is called a contrapositive.</p>
<p>The term ! means factorial. For example 100! = 100 * 99 * 98 … * 3 * 2 * 1</p>
<p>I don’t get this:
[P=>Q] <=> [~Q=>~P]</p>
<p>He means P>Q = -Q>-P</p>
<p>Flip and negate. </p>
<p>If I poop, then I’ll be relieved = If I’m not relieved, then I didn’t poop.</p>
<p>wait do u also change the sign symbol from > to => ?
lik: He means P>Q = -Q=>-P</p>
<p>I’m sorry to confuse everyone. P => Q simply means “P implies Q” or “If P, then Q.” The symbol <=> means “if and only if,” which is roughly the same as an equals sign. Don’t understand the symbols, they won’t test it. Just get what the words mean.</p>
<p>Flip and negate!
If you read this then I will have confused you even more.
If you are not confused more then you didn’t read this.</p>
<p>have the same “truth”</p>
<p>oh ok gotcha!</p>
<p>Has anyone ever seen any questions on logs/ln/e on ACT practice tests or the real thing???</p>
<p>Thanks.</p>
<p>Logs, yes, but they’re basic, like “solve for x if log(base x)8 = 3.”</p>
<p>how about imaginary numbers?</p>
<p>No imaginary numbers, but I have seen more complicated logs than that.</p>
<p>I hadn’t yet studied logs when I took the test, so I just guessed and moved on to the next question.</p>