Official 2010 Calculus AB/BC FRQs Discussion

<p>They’ll probably give you points for finding the critical numbers and the chart.</p>

<p>Isn’t the answer 9.184 or whatever? I’m pretty sure it’s that and not 12.</p>

<p>It’s 12. You need to find the absolute maximum of P(t) on [8,12]. So, you find where P’(t)=0 and test those points ALONG WITH THE ENDPOINTS back into the original. The t-value that makes P(t) largest is 12.</p>

<p>Why did so many people find the taylor series one so hard? Did your teachers just not go over it enough?.. i thought the only hard part of that was the error question</p>

<p>Agreed. ^^^</p>

<p>Even the error part wasn’t terrible. My statement went along the lines of: The error is guaranteed to be less than the derivative of the next non-zero value (but i didnt put specifics like (1/6!)>(1/5x6!)… )</p>

<p>Do you think they’ll accept that… i think i have that written somewhere in the box, but not in the actual explanation.</p>

<p>It’s technically Alternating Series Error Bound, but I used the (1/6!)>(1/5x6!) explanation. I thought that a large part of that was being able to manipulate Taylor series. Luckily, my teacher had us do the Taylor FRQs from 2003 and 2009, which had parts almost identical to the parts on this year’s. Check them out if you want.</p>

<p>Oh crap…</p>

<p>For the integrals in the BC free response, do we get any credit if we forgot to add “dy” and “dx” to the end of the integrals…?</p>

<p>Yeah, it’s like -.5 or something</p>

<p>The integral is worth 1 right?</p>

<p>So missing dy/dx would be half off? :frowning: Also, I left my answer to part A as 54 - (4/3)(sqrt(729)). Is that acceptable?</p>

<p>Missing dy/dx loses the whole point.</p>

<p>Coming out of the exam i thought i did pretty well on the multiple choice sections, i wasn’t able to do 2 i think. I think i got in mid 30s right, maybe 35/45 not answer 2. I was going over the FRQ just now, going by the scale someone provided earlier in this thread i think i got:
6/8
9/9
7/9 or 8/9
9/9
4/9
5/9</p>

<p>Realistically though i think i got a tad bit lower, this is a high four/ low five right?</p>

<p>Also, this is my first post :)</p>

<p>The last one about Taylor polynomials for the BC exam was absolute rape. I had NO idea after part two, and just gave up.</p>

<p>For the snow shoveling one, i think i did something really stupid. please tell me that at 6 AM the amount placed is 125 cubic feet and NOT 0. otherwise I got both the piecewise function and the first part wrong…<em>facepalms</em></p>

<p>How much do they curve this by?</p>

<p>For the last one on the calculator part, where they asked for the x coordinate or something like that, for the slopes, you plug it back into the equation, right?</p>

<p>do they give you partial points (like .5) on frq questions?</p>

<p>I THINK they do, but it’s only for things like forgetting a + C or a dx/dy thing or maybe units. Remember, the BC/AB graders are very specific. You have to make sure that you’re answering the question asked. My BC Calculus teacher told me that a couple of years ago, there was question talking about how the distance from one house was closer to another house than from House B. Most people just wrote House A has this much distance and B has ____ distance. They did get points off though, to their surprise, because they didn’t answer in the end, which house was closer. So IDK.</p>

<p>No, guys, my teacher is an AP calculus grader and gave us a ton of inside info. To address some concerns…</p>

<p>1.) The answers to the FRQs probably will not be released until the AP readers are done grading them, for the sake of the integrity of the exam.</p>

<p>2.) They NEVER EVER give out partial points. For instance, on an integral, you get one point for setting up the integral and if you miss dy/dx, there goes that point. She’s been a grader for 10 years and has never ever seen partial points ever allowed. Don’t worry too much though - you probably did fine without that half a point.</p>

<p>3.) They read with you. For instance, if Part D says to use what you found in Part C to find something else (as in the Taylor Polynomial Question), and you got the wrong answer for Part C and used it for Part D, they will NOT mark you wrong for Part D, only Part C. They can be nice sometimes… :)</p>

<p>If you guys have anymore questions, I can ask my teacher and let you guys know!</p>

<p>^ With regard to #2, they generally don’t dock you for the omission of the dx or the dy in an integral. I say, generally, though, because sometimes you can create a situation where it’s unclear if your answer is correct.</p>

<p>For instance, if you are supposed to have 7500 + integral(0,4) e^(2x^2) dx, and you write integral(0,4) e^(2x^2) + 7500, they can’t tell with the omission of the dx whether you’ve intended that 7500 to be part of the integral or not. It’s my understanding that you lose credit in these situations.</p>

<p>Also, to further clarify (3), sometimes there are preconditions for the kind of result that you must have in a previous part to be read with. For instance, sometimes they won’t read with you if you have to work with the result of a separable differential equation if the separable differential equation you got wasn’t exponential. Sometimes, you’re just out of luck.</p>

<p>The official answers are released after the last day of grading, which i believe is June 16th…</p>

<p>^^ I agree with everything TheMathProf said. The dy/dx thing can go both ways and in some instances, they don’t read with you. But basically, the college board can be nicer than you think.</p>

<p>do you know if they actually get the tests or do they get scans? i took bio and i have really bad handwriting so im afraid having it scanned will make it worse…</p>