<p>What was the answer to the one that had HA at 2 and -2 (MC part one)</p>
<p>Also, why was the 2nd deriv graph wrong in the free response, my friend and i got different answers</p>
<p>Sent from my DROID Pro using CC</p>
<p>my calculus teacher gave me this link for calculating your score. play with some of the input options and it will reassure you.</p>
<p>[AP</a> Calculus AB Score Calculator - May 2011 Test Scoring Changes](<a href=“http://www.free-test-online.com/ap/ap_calculus_score.html]AP”>http://www.free-test-online.com/ap/ap_calculus_score.html)</p>
<p>-ln(81) is what I got for constant on free response #5. As long as I did as well as I thought I did on free response I think I’m alright, I’m predicting no more than 10 wrong on MC, and even 10 wrong I think is unlikely.</p>
<p>for Non-Calc MC with the one asking for area between 8x and 4x^3 or something like that did you guys get B.) 4?</p>
<p>@mathisfun111
HA one confused me, I honestly don’t remember what I put. I know two answer options included radicals on either top or bottom, those were choices C. and D. or C. and B. don’t remember.</p>
<p>and in the free response I think the graph was wrong because the second derivative = -(1/5) and therefore it should be concave down? that’s what I said, I could be wrong though.</p>
<p>[bkdbu</a> - Tinychat](<a href=“Live video chat rooms, simple and easy. - Tinychat”>Live video chat rooms, simple and easy. - Tinychat)</p>
<p>Join this! Much safer.</p>
<p>Was inside the diff problem 800-B or 80?</p>
<p>Sent from my DROID Pro using CC</p>
<p>@mathisfun111
I don’t remember it being 800</p>
<p>Usn, do you remember what it was, im trying to rework it.</p>
<p>And what did yall get for the 2nd deriv?</p>
<p>Sent from my DROID Pro using CC</p>
<p>@mathisfun
(1/5)(100-x) I believe</p>
<p>and I got -1/5 for second deriv</p>
<p>same^ And I used the same reasoning saying it would have to be always concave down</p>
<p>How is the 2nd deriv -1/5</p>
<p>DB/dt is (1/5)(100-B) which is 20-.2B…take the deriv of that and u get (-1/5)B’ which is (-1/25)(100-B)</p>
<p>Sent from my DROID Pro using CC</p>
<p>Totally bombed it 
i didn’t pay enough attention from last year’s lol. Oh well. Maybe I’ll get a 3, though I’ll probably get a 2.</p>
<p>the second derivative was -1/5*(d/dx). you had to plug back in the original derivative they gave you and the multiple it by the -1/5</p>
<p>“What was the answer to the one that had HA at 2 and -2 (MC part one)”</p>
<p>I’m not sure but I put (sqrt2, sqrt2)</p>
<p>What did you guys put for the MC question that was something like lim h->0 of s(4+h)-s(4)/(h)? I think I put 52 but it was pretty much a guess.</p>
<p>Yeah I got -1/25(100-B) for my second deriv too and when it came to the free response I said something like according the deriv everything should be concave down up to 100 and the graph given only went up to 100 and had multiple concavities therefore it couldn’t fit. As for the shadow question (sorry I deleted my response earlier but it looks like everyones talking about answers now haha) I’m not 100% sure the answer is B) 2.667ft/sec but I’m pretty sure I worked it out with two different triangles and simply moved the guy over 4ft (1 second worth of distance) then compared the difference in the lengths of the shadows since it said the rate of change of the shadows was constant and by moving him 4ft I should have been able to find the rate per 1 second</p>
<p>Did anyone get -42 as an answer to one of the non calculator FRQ’s? The answer seemed too good to be true.</p>
<p>What was the question?</p>
<p>The lampost shadow question was 2.666667. To solve it, you had to set up similar triangles, where s = guy’s shadow and x = distance from lamppost. (15/(x+s)) = (6/s). Cross multiply to get 15s = 6x + 6s . Then 9s = 6x. Derive to get 9 s’ = 6x’ . Plug in 4 to x’, then solve
for s’.</p>
<p>Edit: Uh, was I allowed to work out the problem?</p>
<p>Yeah the How-to for the lampost question is shown in this video [2.9</a> Related Rates Example 04 (Man walking with his shadow) - YouTube](<a href=“2.9 Related Rates Example 04 (Man walking with his shadow) - YouTube”>2.9 Related Rates Example 04 (Man walking with his shadow) - YouTube)</p>
<p>just replace 5 feet/sec with 4 feet/sec</p>
<p>On one of the free responses that has to do with concave up/concave down and you had to explain your answers… I used the term “cup up” and “cup down”, do you think that the grader will know what I mean, and not take points off? I was just so used to using those terms because those are the ones we always use in class.</p>
<p>Edit: Also for whoever posted that score calculator for the 2008 exam, do the cutoff points between scores fluctuate that much each year? If they don’t I easily got atleast a 4. I put in my worst case scenario and was still closer to a 5 than I was a 3.</p>
<p>That test was too easy. I’m also thankful they decided to reuse a question from the released practice exam about definition of derivative. I definitely would not have gotten that if I didn’t do the exact question the night before.</p>