Official 2008 Calculus BC FRQ Discussion

<p>I got 2(a) completely wrong.
I forgot to divide by 4 on 2(b)
I think I got ALL of 3 wrong except for my guess of less on the first part.
I forgot to find the value of c in 5(c), but I did the whole by-part thing.
I didn't show any work on 5(d).</p>

<p>For FRQ, I'm predicting 9,6/7,1,9,7/8,7.
And I skipped 9 of 55 on the MC. </p>

<p>Can I still get a 5?</p>

<p>I think there were only 45 MC questions which should make it a 1.2x factor to make up a 54 point composite MC score.</p>

<p>Wait, for 2(a), I did f(8) - f(3) / (8-3), since 5.5 is the median of those two numbers and not of 4 and 7</p>

<p>I thought you could only use equidistant numbers?</p>

<p>what? if 8 and 3 are equidistant, why is (8-1) and (3+1) not equidistant from 5.5? both are 1.5 away from 4 and 7, right? i was a bit hesitant on that one though, can someone confirm if f(7) - f(4)/ (7-4) = 8 ppl/hour is correct?</p>

<p>BTW, do you think I'll get any marks if I forgot the initial condition on 4b? (so instead of passing -8 three times I only said one time, without taking f(0) = -2 into consideration. and as for the range on 6d), i put (6, infinity) b/c I forgot the initial condition (again) that f(0) = 8, any part marks? and for 5b, somehow I factored e^x (x - 3 + 1) to e^x (x - 4) [instead of x-2], so i got the interval must be greater than 4 and thus no interval; upon seeing my erred derivative, would I get part marks for relating my incorrect answer on erred info? </p>

<p>aii too many careless/stupid mistakes...</p>

<p>Thanks.</p>

<p>omg, nevermind</p>

<p>100 stupid mistakes..</p>

<p>I hate you self.</p>

<p>wait, also, are stix's answers definitively correct?</p>

<p>And does anyone have the scoring formula for AP calc?</p>

<p>For multiple choice: [# correct - (.25 x # missed)] x 1.2. 54 points possible here.</p>

<p>Frq are 9 points each so 54 points there. Total score is out of 108.</p>

<p>In general:</p>

<p>1- 0-25
2- 26-35
3- 36-52
4- 53-63
5- 64-108</p>

<p>for 6c did you have to differentiate implicitly to find the coefficient of the second term in the series?</p>

<p>Also, how many points do you think 6c and 6d are worth?</p>

<p>6c is probably 2 points (1 for 2nd derivative, 1 for answer) 6d is probably one point for the answer.</p>

<p>And yes you had to differentiate implicitly d/dx[(y/8)(6-y)]</p>

<p>the first implicit derivative was zero, right? When I did the second implicit derivative, I got the first derivative as a factor in the second derivative, and so I got that the second derivative was also zero. I knew this was wrong so I just ignored that factor of zero and got the correct answer. Will they care, and what did I do wrong?</p>

<p>haha i evaluted part b of question 1</p>

<p>oh well. it was like some weird decimal less than 1</p>

<p>did you guys get the bounds of 1b to be weird decimals too</p>

<p>I really hope they can read my writing on 6.c). It was a mess. And yes to the post above. They were like 0.5 something and 1. something</p>

<p>ok good(10 char)</p>

<p>if i evaluted it shouldn't take off as long as my integral was right right?</p>

<p>yeah so for 2d, I set up the integral and what not and got the answer...but when i evaluated the integral in my calculator I accidentally put in integral of 500e^whatever, instead of 550e^whatever...so instead of getting 900-something, I got 888-something :(</p>

<p>How much credit will I loose? Will I get 0 points for that part? This is depressing :(</p>

<p>probably just minus one for the answer as long as you had the set up ok :)</p>

<p>do not worry</p>

<p>what would be the composite scores for getting a 5 and 4 if this year's curve was the hardest curve possible?</p>

<p>Hard to say. I know back in the 1980's, the curve for a 5 on the AB test was over 80 for a 5 and in the high 60's to get a 4.</p>

<p>I don't know if we'll ever see those days again, though.</p>