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Hey guys, I made a post earlier and I did not get any replies. I am really desperate this time. Does anyone know or know somebody who will be able to give me some help on benford's law for my IA. I need to be able to understand the depth of it to write my IA and any help is appreciated. PLEASE ANYONE WHO KNOWS ABOUT IT, REPLY PLEASSSSEEEE Usually it is a topic taught in univeristy classes and commonly in economics! THANK YOU EVERYONE FOR HELPING ME OUT (if anyone does....PLEASEEEE..)

Hi again, so my exam is in a few days and I'm pretty much done studying. All I'm really wondering is, are there any calculator tips or any videos/websites that thoroughly explain the functions of the Ti 83 Plus Graphing Calculator? Particularly for like probability or statistics but any general special tips or hacks would be nice. If you have any videos, websites or just personal tips, please let me know!!! Thanks!!!!!

Hey guys, I'm studying for the May 2019 IB exams and I'm currently stuck on vectors. I was wondering how you find a perpendicular and/or parallel vector to a 3D vector? For example. "Find an equation of the line perpendicular to vector (3, 0, -1) and passing through point (4, 2, 1)." or, "Find the equation of the line parallel to vector (3, -2, 8), and passing through (3, 1, -2)" Thanks in advance

Hi I'm wondering if anybody can explain the reverse chain rule to me? I don't mean the whole U-Substitution thing, I mean the "shortcut" way. The formula is ∫f'(g(x)) · g'(x) dx = f(g(x)) + c. Also, we haven't learned calculus and trig or calculus and logs yet so please just use basic equations in any examples. Thank you!!!!

Can you use the TI-83 (plus) calculators to create a frequency histogram with uneven classes? (we call it a frequency density graph) If so, how? (I'm not sure how to input the ranges, for example, the range is 0-30, 30-40, 40-60 etc. I have calculated the frequency density itself I'm just not sure how to create the graph on a calculator.)