Discussion of 2009 AP BC Calc Free-Responce Answers

<p>any idea how much ill lose for forgetting dx’s on integrals? </p>

<p>^I wouldn’t think that much…if any at all.</p>

<p>wow, im so careless when the grpah had 0.1, 0.2, and 0.3, i just used that as 1,2,3…damn</p>

<p>could you explain 1d? my a, b, and c are the same</p>

<p>Larry does live 1.6 away (integral of his velocity)</p>

<p>Carren lives 1.8 miles - .2 miles - .2 miles (the first two triangles get taken away cuz she goes back to get her book)=1.4 miles</p>

<p>1d you have to intergrate from(0,12) on the function to get 1.6 for larry
for caren you have to find the net area, meaning everything from [0,4] is meaningless, and you just need the area from [4,12] that gives you 1.4 miles</p>

<p>hey guys i had the same a and c, but like i said before i didnt really see the decimal point bpart b was 16 and part d i compared 1.6 with 14…stupid i know but do they give partial credit if you attempted it correctly but made mathematical error?</p>

<p>I subtracted 1 .2, but forgot the second…see what I mean by stupid mistakes?</p>

<p>ah I only subtracted 0.2 so I had them both at 1.6</p>

<p>Same, lawlroy, but we should get a least some credit.</p>

<p>anyone remember their function for number 4. Im not 100% sure but I remember y=4e^(-x^3/3) something like that…anyone else?</p>

<p>

It asks for t=0 to t=2, reread the question.</p>

<p>Caren’s house was closer than larry’s</p>

<p>Sixthsense: I believe I got that as well.</p>

<p>I didn’t get C=4
I got it equal to something negative I think… hmm…</p>

<p>it should be 6-4e^((-x^3-1)/3), but I got 6-4e^((x^3+1)/3) how many points off will that be?</p>

<p>^dont worry separation of variable problems are usually 4-5 points as long as u did everything else up to that point right it would prbly only be a point off or so.</p>

<p>for 4c i got y = (-4/[e]^(1/3))e^(-1/3x^3) + 6</p>

<p>i think thats what i got</p>

<p>same zhong</p>

<p>for 5 d i did linear approximation and was like f(7)=f(5)+(2)*(f’(5)) and that was 4 which satisfied the inequality. Did anyone else do that. For the other part of that question i did a slope calculation and got 5/3 i think.</p>