<p>learning the entire course tonight by reading barrons…
gonna be a long night</p>
<p>@aquamarina (“How do you solve this problem?
After 200 million years, only 1/16 of the original amount of a radioactive waste will remain. The half-life of this radioactive waste is how many million years?
I know how to do the opposite, but not his.
5 steps to 5 never show how!”)</p>
<p>Just go in reverse (basically double every x years).
After one unit it’s to 1/8
After two at 1/4
Three…1/2
Four…whole!
200/4=50
or you can use the exponential growth formula twice (to find rate then time), but you end up with lots of lns and it’s needlessly complex :)</p>
<p>Now about that grading system…?</p>
<p>Bump, do we need to know percentages of all the specifics like extinction in the last century.</p>
<p>@ univlife
I read a thread (I can’t remember which) that curve is generally above 90/150. And it seems this year’s curve has gone up so like 93-ish. or like a medium B.
@TheAFrent
I would ignore those if you are cramming…because we don’t have enough time and there are many other important things to memorize.</p>
<p>Barrons APES is one of the worst and most redundant study guides ever. Have fun ^</p>
<p>I am sorry to bombard you guys with questions…but my prep books suck and I have no idea where else to turn to.
If you have the practice exam, please teach me how to solve problem 57-58. It is math again.
OR would you tell me where to find all the math ES equations…so I will just try to look up 
Thanks!</p>
<p>@mchammer312
I feel the same way to my 5 Steps to a 5.</p>
<p>oh ****…
any free resources out there that cover everything that you would suggest someone who didn’t learn a thing in APES could at least skim through in one night?</p>
<p>Someone (can’t remember who) in this thread suggest this [NEW</a> YORK EARTH SCIENCE TEACHER](<a href=“http://nyearthscienceteacher.com/3091/4814.html]NEW”>http://nyearthscienceteacher.com/3091/4814.html)
It’s really good.
Thanks to that person!
Those are very very helpful in MCs.</p>
<p>Smartypants saved me, but it’s unfortunately not widely circulated.</p>
<p>Also here are notes teachers put up: You can download them and go over them.
[AP</a> Environmental Science](<a href=“http://apenvironmental.blogspot.com/]AP”>http://apenvironmental.blogspot.com/)
[AP</a> Environmental Science](<a href=“http://www2.visalia.k12.ca.us/eldiamante/teachers/lmiller/]AP”>http://www2.visalia.k12.ca.us/eldiamante/teachers/lmiller/)</p>
<p>Anyone wants to help me on 57-58 on the Practice Exam?</p>
<p>do we have to know any math related to species richness/the island biodiversity things.</p>
<p>BARRONS AP IS TERRIBLE! Too much information, confusing information, and just senseless information. GOD.</p>
<p>Yeah! The same goes to 5 Steps!
Back to my question: Please help me with the 57-59. Thanks a lot!</p>
<p>aquamarina- I missed all 3 of those. Got 78/100 overall. What’re you guys getting?</p>
<p>mrbh12- That’s a 5.</p>
<p>@aquamarina -Are you talking about the 2003 test? If so I can help on 57-59.</p>
<p>No, the audit exam</p>
<p>The exponential growth formula is a waste of time, the best policy is the rule of 70, you can derive it from the formula if you don’t believe me, but if you devide 70 by your growth rate, in this case 3.5, you get your doubling time. So…</p>
<p>70/3.5=20 years, so from there, 40 years/ 20 years= your population will double twice 100(4)=400 million</p>
<p>I am not even finished yet!
Cause if I don’t get something, I will go stop and try to figure it out
And OMG! It takes a long time!</p>
<p>@TheOtherKid
What are you talking about? I mean, which question?</p>