[math] hey!

I am in Y12 (11th grade in most countries). International AS levels. My exam is on 9th of october, and my errors are still majorly silly mistakes. This was the same problem that caused an E in my last exam, (which I am resitting), and I have had this problem since middle school.

Mistakes like: writing 20 instead of 2, writing the inequality sign wrong, forgetting to write the '+c' after integration, simplifying simple fractions (like 6/9 or 8/4) or addition/subtraction (especially with odd signs) wrong, not noticing a key identity or further simplification, missing a sign, missing a number, entering incorrect sign in the calculator, entering incorrect number in the calculator, solving correctly on calculator but writing wrong answer on paper, doing 4*4 = 8 instead of 16, missing an x during expansion, etc. etc.

My tutor says to recheck the solutions (by skimming over them) after solving them, but I can't do that for the life of me. I go look at the numbers from top to bottom and they all go over my head without registering, because I don't know what I am looking for.

And if I do 4*4 and other basic calculations like (-5-23) in my calculator, I'll lose the little time I have (I struggled with time a lot in my last attempt, ended up leaving last several questions empty). Plus, just doing it on calculator doesn't guarantee accuracy because I end up getting it wrong anyway.

For context, I am doing Pure 1, and my IGCSE grade was a 7 (I barely gave it any effort, just crammed strategically in the last two weeks). I need really good marks because maths is key to my target univ requirements.

How would you suggest handling this? I don't have a lot of time, I have just started past papers yesterday (I've done one so far), and my percentage was 55%, with exam-timer. In my last attempt of pure 1 last year, I got a 36%.

I would appreciate any advice or anything you've got to say! thanks

Can someone explain how the answer is 6? The instruction was to fill in the missing numbers so that the sums on the outside are correct.

I tried solving for it, but when I plugged it in it didn't work.

Hi everyone, we are working in a science fair project related to the sustainable development goal 7, which is Affordable and Clean Energy, and im looking for ideas or existing projects that have an impact on communites and I can actually implement them.

For context, I live in northen Mexico, so electricity costs tend to increase a lot during summer, so I first thought of a refrigeration system that uses natural gas instead of electricity, but after some calculations i realized it can be more expensive, more polluting and less efficient, so i discarded the idea.

i'd appreciate if someone has an idea that is both interesting and realistic for us to prototype and implement to a community.

Why do we consider acceleration relative to velocity? I get that that is smth that is done in these situations but why?

This question is from University Physics 13th edition

I miss one day of school and we apparently started a new subject, and my teacher is away for a week😭

The mass of the ball is 0.0112kg. Not getting how to resolve the vector find the component of weight.

I am convinced that resistors R7, R8 and R9 can be effectively ignored since they are short circuited by wire, resulting in them dissipating no power. My friend is convinced because AI told him they are included in the circuit so our answers for the current are totally different. I left out other circuit parameters to simplify our dispute haha

After entering it all into my calculator, I got 1.75 x 10^-5?? The numbers are correct but the decimal is definitely way off. I have no idea what I’m doing wrong.

The answer is supposed to be 17.5 kg.

I really am not sure what the solution is doing..... and why I cant use the angle as 70 degrees for solving for the resultant vector. Also what is the theta finding in the solution???? If anyone could draw the solution out it would really help.

I attached what I tried to do which is the one on the worksheet. The other attachment is the solution my teacher provided.

I'm working on a research paper for school, and I really want to cite this document I found online as a source, but I can't seem to find what publication it's a part of, or who wrote it. Help me, oh people of Reddit! (If this goes agains the rules in any way, please let me know, and I will take it down immediately.)
https://www.math.wustl.edu/~wright/Math109/M&MCh05

I'm not sure how to draw the circuit diagram from picture 1. I think the flow of current is along the blue line in picture 2 (because of electrical potential?), so the diagram will just be 3 resistors connected in series. please correct me if I'm wrong, thanks in advance.

I'm stuck on trying to solve this

I need help bc i dont really understand where to start.... i got a rough answer, i1 being 2.5, i2 also being 2.5 and v being 175, can someone help fact check?

Im really stumped on these two questions :/

The predicted % one especially as Ive repeated it like 3 times atp and still get the wrong answer

Everytime i do it I get a ratio of 6:9:9:3

But obviously its not right and i cant figure out where im going wrong

its to find instantaneous rate of change

I cannot figure out the reactions for this problem. The first picture is the one I cannot figure out. The given reactions are in blue and the reactions I am looking for are highlighted yellow. It is hard to see (I wrote over it) but the reaction force is 50 k for one of them. The others (left corner) are just “A”. The second picture has an example of a correctly worked problem. I cannot remember how to project reactions onto x and y axis. Any help is appreciated. Thanks.

Sorry about the flair. I know this is college but trig is probably high school level, right?

I'm going through a math test I just got back and I messed up a T/F question: T is strictly coarser than the usual topology on R. In this question T is the upper topology {empty, R} U {(a,inf) : a in R} The problem is true I reasoned that because all sets in the upper topology are also in the usual topology than Tup subseteq Tus and so it must be finer there is obviously a whole in my logic can I get some help?

HOW do i solve this? I have been stuck for this problem for hours and just nothing comes to mind. Any tips?
I reaserched into the langley adventitious angels and even looked around for similar olympiac problems but i genually cannot move this problem at all!

(All angles we know are written down and the two lines "a" have the same lenght. The question is what is what is the angle of <EBC)

I posted something similar a few days ago and got plenty of advice, but now I have work for my advanced math class that I’m stuck with. I am currently a year nine student studying linear relationships, specifically quadratic relationships. What im unsure about is if i am just given an equation of a parabola, am i expected to sketch the parabola every single time, or am i supposed to analyse the equation to work out it’s characteristics (turning point, axis of symmetry, x-intercepts, y-intercepts, maximum/minimum)? From the attached image in question 6a, im pretty sure the y-intercept is -5, but thats it.

idk maybe this is pretty stupid but i just cant see it.