AP Calculus AB 2015 Thread

I remember 9 being the area on the left and 12 being the area on the right.

negatives?

I can’t even remember what answers I had for that at this point. All the discussion of the problem has stirred up my memory. Just gonna hope my common sense didn’t fail me and I used the right area for the right point lol. I feel like the area on the left was 12 and the right was 9 based on the way the graph looked but idk.

@PilotKhyle They were both below the axis.

This is like a left shark vs right shark issue.

i am 99% sure right was 9 and left was 12 so f(4)=15 f(-2)=-6

I thought it was negative and decreasing though? (for the velocity and acceleration problem)

Yes

@ohmloo they are talking about the question with a graph of f ’ (x) that is under the x-axis and the area of two sections is given and you are asked in one part of the question to find f(x) at x= -2 and x = 4 or similar numbers.

I switched the areas given to negative because the regions were under the x-axis. Also, they can’t give you an area that is negative because areas CAN’T be negative but the integral can be negative which is why sometimes you use absolute values with integrals to find the total area or you divide the integral and subtract the negative portion to get the total area.

@rockinman1 I think what you said (left is 12 and right is 9) is correct but at this point it doesn’t really matter.

Hopefully they release this year’s FRQ soon!

@Eggyolk As far as I remember, they actually worded the problem as something like “the area under the curve on [-2,1] is 12 and the area under the curve on [1,3] is 9.” I’m not sure which was 9 and which was 12, but I don’t think they stated the integrals were those values.

Does anyone else remember it stated like that? I may be remembering wrong.

Okay, so in the question about vertical tangent points, did you have to find a list of specific points? I think my answer was like (3y^2 , y) or something along those lines, which makes sense because those are the points when derivative is undefined.

What did you guys do for the FRQ that asked for volume of perpendicular cross sections of squares?

It should have just been the integral of the function squared.

@Ontara 1.283

@MusEd1 (top function - bottom function)²

Yeah, yeah. That’s what I meant,

Alright so is it possible to get pass a 3 if you completely bomb the FRQ

Hi everyone! I am a math tutor and AP Calculus AB is the one class I tutor most kids in. When they release the FRQ’s in a day or so I will do the problems (they don’t release the scoring guidelines for a few weeks) and we can discuss any questions you guys may have since at that time it is “legal” to discuss.

In the meantime, if you have any generic questions you would like answered I am more than willing to help you out.

If you literally get a 0 on the FRQ’s, you can still get a 3 on the exam if you answer about 34 of the 45 questions correctly on the MC. In general, you need about 39 to 40 converted score to get a 3 and since they multiply your raw MC score by 1.2 to get the converted score, getting 34 right leads to a converted score of 40.8 which they truncate to a 40. They do not round up, unfortunately.

Assuming you got around two points on every frq, you’d probably have to get around 26 multiple choice questions right.