You have no idea how much you've done for students like me. Thanks for doing everything you can for us calc students who would have no idea what they would be doing without you.
Thanks for the explanations, I now see some of the careless errors I did on the test that I could have definitely gotten if I had more preparation time. It is what it is, just gonna hope for at least a 4.
For 6a, I would be wary of leaving off the requirements for the AST. Normally I wouldn't think so, but carefully note that the instructions are to JUSTIFY your answer. Typically "justify" problems require essentially FULL reasoning/defense/explanation/support for your answer. Without stating the requirements (positive, decreasing, alternating) for using the AST, I'm not sure that the standard of "justify" has been met.
Looking at it now, I think I should have included 0, but at 5 the function is neither increasing nor decreasing so you can either include it or not include it.
You're given the graph of f' (the derivative of f), so anywhere f' changes from increasing to decreasing f'' (the second derivative of f) will change from positive to negative. (Similarly if f' changes decreasing to increasing, f'' changes negative to positive.) We don't need f' to be differentiable for f to have a point of inflection. We just need f to exist at 6 and for f'' to have a sign change (which happens at the relative extrema of f'.) Hope this helps!
random question about question 4- what if, hypothetically, one were to write out the entire IVT explanation correctly, but write “by the MVT” at the end? asking for a friend :)
Hmm...I would think you'd lose a point for setting up but be eligible for integration by parts and probably an answer point. Why'd you multiply by ln(5)?
Because the question is asking for the volume, xe^x/5 is the rectangular cross section to 1/x, so you would have to multiple 1/x to xe^x/5. When you do that, you are basically solving the integral for e^x/5 That is how I solved the question, I am not sure if I completely misunderstood the question, otherwise, thank you so much for this. Brock my confidence on the test, but at the same time, is also kinda building me up Edit: to anyone reading this, multiplying 1/x is wrong since the area is givin to you. My explanation is wrong
Problem 4a you messed up when yoy simplified. It should have been .2 instead of -.2. Making a simplification mistake after warning about how you shouldn't simplify because you will make a mistake is hilarious
Yeah, people have been enjoying pointing that out for over a year now. It’s weird, too, how I edited in a scroll that points out the error but people always comment it anyway.
Question does ap calc like even though like I wrote the bounds wrong on an integral but I got the right answer for that wrong integral would I still get the answer point because I know for like chemistry if u accidentally messed up one part of the frq as long as u carry through the wrong answer u could still earn later points
Yes, they "read with you" if you make a mistake. If it's something that trivializes the problem, you'll lose points. But if you have to carry over an answer and your answer is wrong, they try to make sense of your work from there.
I'm watching this for preparation for tomorrow's ap test, thanks for this practice for me!
You have no idea how much you've done for students like me. Thanks for doing everything you can for us calc students who would have no idea what they would be doing without you.
Really appreciate this comment!
Thanks for the explanations, I now see some of the careless errors I did on the test that I could have definitely gotten if I had more preparation time. It is what it is, just gonna hope for at least a 4.
Seeing this now knowing I probably didn’t get that 5
I was feeling really confident until now :/
aye but on the bright side its like less than a 50% ish for a 5 and if a lot of people do bad then the curve will be even better
@@lucasmacaraeg1537 💀
How did you end up doing?
@@miksterz7134 4 gang
in 4a, it is 0.2 not -0,2, you may forget to change the sign.
He said it in the bottom lol.
Yeah i saw that
For 6a, I would be wary of leaving off the requirements for the AST. Normally I wouldn't think so, but carefully note that the instructions are to JUSTIFY your answer. Typically "justify" problems require essentially FULL reasoning/defense/explanation/support for your answer. Without stating the requirements (positive, decreasing, alternating) for using the AST, I'm not sure that the standard of "justify" has been met.
My Calc AB teacher straight up put some of these on one of our Unit 3 tests. Proud to have gotten them right :)
nice! i guess now you really know how to study for you tests in class and that'll definitely help you getting ready for the ap exam in may!
4a) shouldn't that be positive .2 cm/dys^2
Thanks, yeah, that scrolled across the bottom as the answer was written out.
Watching the morning of the test
For 3c, shouldn't the answer be 0
wondering the same question
Looking at it now, I think I should have included 0, but at 5 the function is neither increasing nor decreasing so you can either include it or not include it.
agree with zero included
On 3b, wouldn't x=6 not be a point of inflection because it is a sharp turn, hence it isn't differentiable at that point?
You're given the graph of f' (the derivative of f), so anywhere f' changes from increasing to decreasing f'' (the second derivative of f) will change from positive to negative. (Similarly if f' changes decreasing to increasing, f'' changes negative to positive.) We don't need f' to be differentiable for f to have a point of inflection. We just need f to exist at 6 and for f'' to have a sign change (which happens at the relative extrema of f'.) Hope this helps!
@@turksvids Ok thank you for clearing this up!
random question about question 4- what if, hypothetically, one were to write out the entire IVT explanation correctly, but write “by the MVT” at the end?
asking for a friend :)
Heh...not sure on that one. At most it would cost you one point, though.
@@turksvids thank you thank you
yessir ez hw solutions
was this the only version released? just curious since the version of the test i had was completely different
Unfortunately, yeah. Half of my students said they also had a different version!
I haven't seen any of these questions in the exam too
honestly i forgot all of my answers so why am i even checking this out
Thanks for these vids!
Glad you like them! Lots of others that might be helpful if you check out the channel!
For 5b, if I did the integral of ln5 * xe^x/5 how many points would I lose? I did integration by parts but just multiplied my end result by ln5
Hmm...I would think you'd lose a point for setting up but be eligible for integration by parts and probably an answer point. Why'd you multiply by ln(5)?
@@turksvids I have no idea lol I think I saw cross section and my mind jumped places.
Because the question is asking for the volume, xe^x/5 is the rectangular cross section to 1/x, so you would have to multiple 1/x to xe^x/5. When you do that, you are basically solving the integral for e^x/5
That is how I solved the question, I am not sure if I completely misunderstood the question, otherwise, thank you so much for this. Brock my confidence on the test, but at the same time, is also kinda building me up
Edit: to anyone reading this, multiplying 1/x is wrong since the area is givin to you. My explanation is wrong
Problem 4a you messed up when yoy simplified. It should have been .2 instead of -.2. Making a simplification mistake after warning about how you shouldn't simplify because you will make a mistake is hilarious
Yeah, people have been enjoying pointing that out for over a year now. It’s weird, too, how I edited in a scroll that points out the error but people always comment it anyway.
I appreciate the video
I appreciate the comment!
Hello, my bc calc exams is in may 20th. Are those the questions that I am going to be asked for?
Nah, but the questions are very similar every exam, so it's worth working through them.
what region is this exam?
USA -- administered 5/9/22.
@@ivanmalik3228 i live in cali and didnt get this one...
Its the international version.
Question does ap calc like even though like I wrote the bounds wrong on an integral but I got the right answer for that wrong integral would I still get the answer point because I know for like chemistry if u accidentally messed up one part of the frq as long as u carry through the wrong answer u could still earn later points
Yes, they "read with you" if you make a mistake. If it's something that trivializes the problem, you'll lose points. But if you have to carry over an answer and your answer is wrong, they try to make sense of your work from there.
I'm so confused, do international students testing around the world get different questions? I don't even remember answering these lmao
same
Yeah, there are different versions. Often in the Fall the international FRQs are released to teachers, but they're never made fully public anymore.
there were two forms last year at my school, I got the other form
I got everything wrong
Same lol
vlad
Easily got a 5
Awesome!