Maths SL
For Math SL discussions
1,591 topics in this forum
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Hello, I found a question on my Haese Maths SL Textbook I couldn't solve regarding exponentials: Solve for x in 12*3^-x = 4/3 What I first did was multiply everything by 3: 3(12*3^-x) = 4 -> 36*3^-x+1 = 4. Then I divided the 4 by 36, which simplifies to 1/9: 3^-x+1 = 4/36 -> 3^-x+1 = 1/9 1/9 is the same as 1/3^2 = 3^-2, thus the equation becomes: 3^-x+1 = 3^-2 Since we have equal bases: -x + 1 = -2 -> -x = -3 -> x = 3 Thus I found x = 3. However, in the answers section of the textbook, it states that x = 2. How do I get x = 2? Is there a step/concept I'm misunderstanding as I've redid the problem 3 times…
Last reply by IB`NOT`ez, -
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Hey, for my math IA im doing cooling of a car engine. My objective is to determine how much time it has to pass for the engine´s temperature to be okay for it to be touched. Its related to personal experience. I collected my data and got an exponential decay graph as predicted. Can you guys suggest ideas? I have some but not sure about them.
Last reply by Keel, -
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Hey everyone, I'm running a bit late for my Math SL IA, since I had to change a topic. I want to ask if a topic like the following one will be to simple for Math SL course? "How does the amount of sleep affect a person's school performance" I'm afraid that this topic might be a bit off track or to easy? Thank you!
Last reply by Merril889, -
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Hey guys! I´m doing my math IA on the cooling of a car engine. I was expecting to get an exponential decay regression but I got a logarithmic regression.I collected my own data using a sensor thermometer, Im using non- linear regression. I don´t know how to make the outline of my investigation. Should I use Newton´s Law of Cooling? Maybe try do the exponential regression and find the coefficient correlation and then compare to the logarithmic´s and go against the alleged ¨exponential decay function for thermodynamics? I´m not aiming to get a 20, too frustrated for that. I need a 16 to get a 6 in the IB which was my predicted before the IA came.
Last reply by kw0573, -
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My topic for my math IA is: the mathematical relationship between the vibration of four strings of a violin, i know this is topic is more like physics. did someone do similar topic?
Last reply by Linda Zhou, -
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My IB math teacher told us to hand in the proposal 10 days ago, but then i forgot, do you guys think that i will not be able to do an IA? i am freaking out now !
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What's the best one for SL Math? TI-84plus?
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Hi to all, I need abit of help with my Maths IA. I am doing mine on the game carrom. First i had thought of finding 3 different angles or positions to score a carrom men using a striker. I am not sure if this sounds good or if it will be a good IA or not. So if u guys could provide your views on this it would be much appreciated. Second idea was to analyze the whole game and find three difficult positions to score and form triangles and use trig to find angles once i find the distance in cm. I could then use cosine or sine rule, pythogoras theorem or SOH CAH TOA to find the angle to hit the striker at. I then thought of using calculus to find the rate at which carrom men …
Last reply by s_merali21, -
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hi every one i have a little worry about my ia in maths what i choosed to analyse is link to probability which is "what is the probability that in each continent of the world there is the same amount of stars in the sky?" may someone help me to delop it please.
Last reply by kw0573, -
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Hi, I am a student in the US and you need a certain number of math classes before they allow you to take IB Math. Because of that I wasn't able to take the first year. How hard do you think it will be if I took the second year only. Does the second year cover the first year too, or how does it work? I plan on studying engineering which is why I don't want to take Math Studies. However, if it will be too difficult I will.
Last reply by kw0573, -
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Starting IB next month , wanted to know what is the best textbook for math SL so I can start preparing ? if you could attach a link on amazon or something thatd be really helpful ..
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Question: There's a point (3, 9) that undergoes "a horizontal stretch with scale factor 1/2" The answer for the new point is (3/2, 9). But since it's a dilation in the y axis, should it be multiplied by 2, not half ?
Last reply by turtle turtle, -
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Can we predict the presidential candidates of 2016 based on the ages of the past 44 presidents of the United States of America? Is it too simple?? help
Last reply by kw0573, -
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I would like to ask for help in coming up for a topic for my IA, all I know for certain is that I would like to do something with cardioids but I am not sure how I could form a question for it.
Last reply by terribletouw, -
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Modelling the spread of genetically based cancers over generations.
Last reply by AnjaDe, -
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Hey Guys! When using Binom and Normal functions, Im guessing we can't just write binomcdf and normalcdf right. Does anyone know how we are supposed to write this stuff?
Last reply by kw0573, -
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I know the answer is obviously yes, but I mean does it matter how you arrive to an answer as long as the method is not flawed? 24 hours have not yet passed, so I can't go into detail, but as long as the method is mathematically sound but is not the way it is normally taught, you'll get the full marks, right?
Last reply by TheNintendoChip, -
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Hi, I'm really concerned about not being prepared for the math SL test by May. In my class we are just finishing up topic 3 with vectors, statistics, and calculus left and the teacher has made it clear all of the content won't be covered before the test. I really want/need to pass this SL.
Last reply by Siren, -
Finding zeros of polynomials -HELP!
by Guest- 5 replies
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I have an attachment showing the question - #10. Please hep me solve this. What I know is that p(x) = 0, and that I have to try and factor the polynomial - but I'm stuck on that part. Please help?
Last reply by TheNintendoChip, -
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Hi, can anyone explain how to solve the following Maths SL calculus questions?
Last reply by TheNintendoChip, -
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Hey Guys! So the Math SL exam is tomorrow, and I can't find the answer to my question. When we want to use normalcdf/ binomcdf, whats the difference if the question asks us to find the probability "less than" and "less than or equal to" In continuous data, whats the difference in the inputs?
Last reply by kw0573, -
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Hi! I'm currently doing my Mathematics IA on the mathematics behind a parachute jump. I wanted to find the time, path and landing coordinates of a jump, comparing it to a jump that actually happened. Unfortunately, I can't find a simulator OR any information about an actual jump (speed, time, coordinates etc...). Any idea where I could find something along those lines? Would be much appreciated.
Last reply by Myisha, -
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Im writing the may 2016 exam, not a lot of time. I need to know: What do I need to know to do with my calculator. ( I use the Ti-nspire CX)
Last reply by eross, -
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Hi everyone, I've been having problems with the answers coming out my GDC, specifically the Casio fx-9750GII. 1) The linear regression equations it calculates (ax+b) from data sets are always subtly different to what appears in the mark scheme. I've tried using a+bx and fiddling with the settings, but nothing seems to change them. 2) When trying to use grouped frequency data in the stats mode, it often outputs incorrect information for standard deviation and things like that. 3) The nCd and nPd results are sometimes a little different, although I might just be using them wrong- how do I know when to use which one? Any advice? It's a bit nervewrac…
Last reply by kw0573, -
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Hi for my mathematics investigation, I have been calculating the effect of velocity when the distance is extended. I have taken freefall into account and have used the Oregon state university to find an expression which correctly shows the velocity. http://oregonstate.edu/instruct/mth252h/Bogley/w02/resist.html However, I have found that my calculated value is much different to the value when I use the simple equation (distance/time). Are the calculations from this website wrong? and will I be penalised, or is distance over time an inaccurate representation? Thanks,
Last reply by eross, -
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Hi, I am currently working on my IA and i am investigating the effects of air resistance of drop height. I have gone through the calculations and they are all pretty advanced. I asked my teacher if this is ok and he told me it was but i just wanted to make sure i won't lose marks for this. Would it be ok to do hl maths for an sl IA? Thanks,
Last reply by kw0573, -
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Hey Guys! In paper 2 where we are allowed to used our calculator, what extent are we allowed to use it to find the answers? Like sometimes, the question will give us a velocity equation and ask us whats the acceleration at a certain point. Although I could differentiate it and do it manually, I could just graph the function and find the derivative at that point, skipping working entirely. So how much are we allowed to take advantage of this? Also, when we answer in the exam, are we only allowed to write until where the lines end, or where the box ends? usually there will be 6-7 lines, but the box extends to the ends of the page. Are we allowed to w…
Last reply by kw0573, -
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Hello. I need help deriving this equation using the quotient rule. I'm having difficulty reaching the correct answer because I've no idea what I'm doing wrong. Quotient Rule: (u'v - v'u) / (v2) Equation to derive: (2x-3) / (x2) What I did: u= 2x-3 v= x2 u'= 2 v'= 2x *sustituted into equation to get: -( 2x2 - 6x) / x4 The answer should be - (2x - 6) / x3 What am I doing wrong?
Last reply by King112, -
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Hey! I want to buy the new book (the green one, I already have the old, blue version) hoping that I would understand math somehow better. To me, it seems good in terms of explanation and exam-like-practice problems. But do you guys recommend it or any previous experiences with it? Does it fit with the May Exams 2016?
Last reply by Noticeably Absent, -
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Hi, So I'm been doing loads of past papers in maths and I was wondering: can points be taken off for using the GDC? For example, as I have a TI-84+, I can do the invnorm, normalcdf etc for non-standardised means and standard deviations without calculating the standardised value z. However, when I look at markschemes, they seem to suggest that you need to have worked out the z value... But I still get the correct result and show all of my working so surely it should be fine? If anyone has any insight I'd be grateful as I'm not going to see my teacher for a while. Daisy
Last reply by daiisycurtis, -
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So I was looking at criterion D : Reflection This criterion assesses how the student reviews, analyses and evaluates the exploration. Although reflection may be seen in the conclusion to the exploration, it may also be found throughout the exploration. 1) What does this mean 2) How are you meant to show this in your maths IA Thanks!
Last reply by turtle turtle, -
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Hi for my math exploration I'm hoping to find a function that accurately represents the growing population of China. So far I've fitted linear and an exponential curve onto my data and gotten the equation. However I believe that a logistic curve would be the ideal equation but I'm currently using Logger Pro and I have no idea how to fit a logistic curve onto my data. Any help would be very appreciated as this exploration is due very soon!
Last reply by Genri, -
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Particle P is initially at the origin. It moves with the velocity function v(t) = t2 - t - 2 cm/s. a) Write a formula for the displacement function s(t). This is the integral of the velocity function. So, s(t) = t3/3 - t2/2 - 2t b) Find the total distance travelled in the first 3 seconds of motion. Ok. This is the part I am having difficulty with. So, I set the v(t) = 0 and solved for t. I got t = 2 and t = -1 I substituted those 2 numbers in the s(t) equation; s(2) = -10/3 s(-1) = -5/6 I then did s(3) = 0 and s(0) = 0 Doing that, the Total distance formula says to absolute vale the v(t) function. So I did abs(v(3)-v(-1)) bu…
Last reply by kw0573, -
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I am in trouble with my exploration. I am over the deadline of choosing a topic, but I am still kind of lost. What i know about myself that I like statistic the most. As a "hobby", starting from 2015 january I have been writing down all my expenses. I have a full 2015 excel file of every expense of mine, categorizing them such as, food, coffee, clothing, concert etc. I calculated monthly earned money, spent money and the difference of these. I do enjoy writing it down, seeing clearly what I spend and what I earn, I also like the calculations I can make in excel (I have an exam certificate of office programs -- i have the hungarian school leaving final exam from…
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Last reply by ib_super, -
IA Math IA topic. Spread of diseases or Math in bridge buillding? DUE TOMORROW!
by Guest Rohit Pawar- 1 reply
- 1.9k views
Hey guys, im in Math SL and have an IA due tomorrow! I still am unsure about the topic I should choose. Should i do it on Spread of diseases or on math used in bridge building? Also how much of my IB grade does it affect?
Last reply by Ditteee, -
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I've never really been a math person all of my life, and unfortunately my school doesn't offer math studies. I'm struggling with the course, because last year, I did not get prepared well for this SL course at all. Do you guys know any resources or practice books I can use to improve significantly? Dont't mention Khan Academy because I already watch his videos in order to get the hang of the basics!...
Last reply by simtiaz, -
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Hi, the question is: 5% of computer processors are defective. Processors are selected at random and put into packs of 15. (b) Two packets are selected at random. Find the probability that there are at least two defective processors in either packet please help, thanks so much!!
Last reply by kw0573, -
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So I´m currently on a 2 week break from school so I wanted to take enough time to come up with a good topic for my IA. I want to do it about the recent terrorist attacks and some of the comments from the republican candidates (saying that muslims shouldn´t enter the country because they might be terrorists). I planned on doing something related to correlation or probability, but I´ve read that those topics are not strong enough for sl. Should I add something else? I haven´t seen calculus in my course but maybe I could use it in my exploration aswell... But i dont know. Should I look for another topic?
Last reply by kw0573, -
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Last reply by simon9867, -
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Hello there, I'm a student in SL Math, and I'm having difficulty coming up with a topic for my IA. I was thinking along the lines of medicine and diseases. If you could offer me any sound ideas, you'd be a hero. Thank you, Lee
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So I am reviewing for my exam on antiderivatives and integrals and I am really stuck on this one particular question. The question is: Find the area between the indicated function and the x-axis. y=x3+2x2-3x from x=-4 to x=1. The answer should be (100/12) units2, but I keep getting the wrong answer Any help is much appreciated!
Last reply by ShootingStar16, -
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Hey All! I just did my Maths Mock Exam for Standard Level, I am aware that a candidate will only be graded on the content that they write within the answer boxes, however, I was under the assumption that you are allowed to ask for scrap paper. I asked my invigilator for scrap paper during the examination and I was denied it. I have been looking online for a while now, I can't find the statement that students are not allowed scratch paper for working out in exams anywhere on the IB website or the documentation for the exams. Would you guys be able to shed some light onto this? Where does it state that we're not permitted to use it apart from the implication that we're…
Last reply by Vioh, -
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Hey, I need an answer ASAP. I did my physics IA and the teacher said its really good, however my math is very bad and the teacher wants me to improve a large part of it. But i was thinking if i can take my physics data and topic just base it more on the math side? Its not plagiarism if i take it from myself neither is it a topic that someone else did. Please help thanks a lot in advance.
Last reply by Elite X-Naut, -
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The probability that Greta’s mother takes her shopping is 2/5. When Greta goes shopping with her mother she gets an ice cream 70% of the time. When Greta does not go shopping with her mother she gets an ice cream 30% of the time. Determine the probability that: a Greta’s mother buys her an icecream when shopping. b Greta went shopping with her mother, given that her mother buys her an icecream. I keep on getting the wrong answer
Last reply by L'estrange98, -
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So, this is something I'm mulling over a bit, whether or not I should go with Maths SL or go for the Maths Studies SL. I am solid 5ing Maths SL and I am seriously not cutting the cheese. I need 7s for my goals. So, my aim is Medicine (yes, I understand that Maths is important-ish in terms of medicine.) I'm confident that I can score a 7 in Maths Studies and I know that Sydney University won't require Mathematics as a prerequisite until 2019, which will be essentially a year after I graduate. So it shouldn't affect me and there are no entry requirements, therefore I can make it into pre-med, if (big ifs here) I get 45 and I do Maths Studies. However, the thing is, Maths …
Last reply by aTeddy, -
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Hello, I've recently started working on my Math IA. I needed to choose something that would include Calculus or Math Analysis. After choosing optimization as my topic, I tried to use it by figuring out the size of a box in which to package a computer case. After doing the math and finding the estimated volume, I wasn't sure what else to add. I got feedback from my teacher saying, "It shouldn't just be solving the problem". I was very confused on what she must have meant. What else should I be adding? I was thinking about the foam (space it takes up in the box) that is used in packaging to protect the case but I don't know what else I should be adding.
Last reply by Johnny760, -
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Hello everyone. I'm revising for my exams this may and I have some troubles with part (b) of this question: "A curve is such that dy/dx = 4x + 1/(x+1)2 for x>0 . The curve passes through the point (1/2, 5/6). " a) Find the equation of the curve. My result is : y = 2x2+ 1/(x+1) +1 b) "Find the equation of the normal to the curve at the point where x=1" Do I put the x value into this equation to find the y-co ordinate?(When calculated, y= 5/2) I don't know what to do. Do I take the derivative and calculate it that way? Any help/suggestion would be appreciated!
Last reply by mac117, -
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I'm Mitch, and you might know me from my hundreds of Math SL videos on Youtube: https://www.youtube.com/user/CampbellMitch/playlists I did an insanely detailed analysis of every single IB Math SL exam question, looking at what comes up most often, what's most difficult, etc. I'm happy to share the results of this with you. I'm doing a third instalment of my free office hours - here are the details: Wednesday, Feb 17th, 2016 Time: 3pm CET (so it's 3pm in Denmark). Sign up here: https://studynova.com/office-hours-february-2/ It was so much fun to do the last two office hours, I'm happy to share more with you! I'll be using Google Hangouts on Air again, since it wo…
Last reply by Sandy, -
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If there's an outlier in my data set e.g. 3, 5, 4, 3, 99 (99 is the outlier): is the range 99-3 = 96 or is it 5-3 = 2 (excluding the outlier)? any help would be much appreciated i have a test tomorrow lol!!
Last reply by Vioh, -
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Hi there Does anyone know to how many significant figures should the answers be given in an exploration? Is 3 significant figures ok or is that too precise?
Last reply by kevG,
