<p>Discuss all work and answers here please.</p>
<p>I thought it was OK, some questions were really hard.</p>
<p>For the inverse cosine graph i got (3) i think
For the probability one (write in) i got something like .20987…
For the one with the clock i got 5pi/6, or 150 degrees</p>
<p>and i can’t remember any other right now.</p>
<p>It was hard. That’s all I am going to say</p>
<p>Am I the only person who thought that y =x2-6x doesn’t have an inverse? B/c unless the teachers have been lying all year it fails the horizontal line test and isn’t a one to one function so it can’t have an inverse. Also for the sin 75 one did you guys get radical 6+ radical 2/ 4?</p>
<p>i got radical x-6 but i knew it was wrong</p>
<p>I thought it was quite easy, umm for the probability fill in, I got 17/81; I also got (radical 2 + radical 6)/4—this was the right answer, discussed with my math club supervisor after the test…umm…the inverse was radical(x+6) if I recall correctly…umm…the e one was 8…did you guys get -5376 as the coefficient and 5040 as the number of different committees? those were the two that I had to think on…</p>
<p>Parabolas don’t have inverses though they fail the horizontal line test and more than 2 values for one x if reflected over y= x. also for committed i got 10 c 4= 210</p>
<p>i got 10c4 at first but then did 1op4 for some random reason i should hace kept my first answer same thing happened w/ e^xlny i goy 8 the 13.something DAMN ME</p>
<p>What was the answer to the last multiple choice? Was it logarithmic (the plot)?</p>
<p>Yeah I’m pretty sure it was logarithmic. But I don’t understand the committee of juniors one. Why isn’t the answer 10C4, which i think i remember it being 210 (choice 1)?</p>
<p>I beleive it was 10 C 4. It mentioned other students but only asked for the different combinations of Juniors.</p>
<p>^Yeah that was my reasoning too. Some kids put 10!9!8!7! and got choice (3) though so idk.</p>
<p>wait for the equation inverse part II
what if i put plus or minus rad x+6 of whatever it was
is that right
or is it only positive</p>
<p>^Answer was 10 X 9 X 8 X 7. What was the answert to the Pythagreom Theorum?</p>
<p>i was pretty sure it was 10C4?</p>
<p>^There are a total of 10 juniors for 4 positions. 1st position has 10 possibilites, 2nd position has 9 possibilities, 3rd has 8 and 4th has 7. So 10 X 9 X 8 X 7 = 5040.</p>
<p>but it asked for committes so don’t u use C…
and did everyone get 17/81?!</p>
<p>By looking at a simpler case it will be clear that it’s not C. If, for example, they would say there are 3 juniors and ask how many different combinations of 3 there could be, the answer would be 3 X 2 X 1 or 6. If you would use C, you would use 3 C 3 which equals one. There is obviously more than one combination possible. If you apply this to the Trig question you will see the answer is 5040. Let me know if this clears things up.</p>
<p>Combinations and permutations are different though!</p>
<p>Combinations-order doesn’t matter
In a committee- order doesn’t matter at all because everyone is at the same level.</p>
<p>If it was like a leadership council, where order matters, you would use a permutation.</p>
<p>However, order does not matter, so it’s 10 C 3, hence 210. Checked with my math teacher :)</p>
<p>Judging by all of your itelligent answers, I didn’t too so well. Oh well, I did alright in the course. As long as I score a 90 I’ll be satisfied.</p>
<p>We never learned about the first question, with the controlled experiment, but I knew it from biology. How does that relate to mathmatics?</p>