Member: CoolStuffYT

36 Questions
601 Answers

628

+1252

Modular arithmetic: no solutions in x

Given that x is a positive integer less than 6, how many values can k take on such that 3x = k (mod6) has no solutions in x?
For smaller numbers like this you can just test solutions, but I'd like to know how to do these problems when the numbers read more ..

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CoolStuffYT Jan 6, 2021

1634

+1252

An idea to stop cheaters?

I have an idea to stop cheaters, or just people that dump homework and don't explain in general.

First, we could have a character minimum so people can explain what they've tried. In case some people try to get over the limit by typing read more ..

off-topic

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CoolStuffYT Jun 20, 2020

848

+1252

What has this site become...

Ok. I'm going to be honest here.

Back when I joined 1.5 years ago I really enjoyed the site. People were eager to learn and ask questions. The forums were much more active with curious learners and answerers. But now, I read more ..

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CoolStuffYT Jun 17, 2020

786

+1252

Stay Safe during COVID-19!

As probably all of us know, the coronavirus (COVID-19) is infecting hundreds of thousands of people across the world.
Please Stay Safe! Remember to social distance and wash your hands for 20 seconds!
-CoolStuffYT

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CoolStuffYT Mar 26, 2020

929

+1252

Triangle Area Geometry

(Please ignore the scribbles on right.)

I was relatively sure it was D, since all we know is BQ=QP but not that DQ=QC or anything. read more ..

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CoolStuffYT Mar 22, 2020

886

+1252

Optional Survey

https://forms.gle/wUdamtuZQvvnWzEK6
Fill out this optional survey if you want. Only one question :)

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CoolStuffYT Feb 5, 2020

920

+1252

Cauchy-Schwarz Inequality

Hello all!
Can anyone explain to me in-depth about the Cauchy-Schwarz Inequality? I'm stuck on it and don't know how to use it.
All tutorials and websites online use dot vectors and lists and other calculus terms I don't understand, so a read more ..

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CoolStuffYT Feb 1, 2020

887

+1252

Rational Function Equations

Let and be real numbers such that and
.
Find all possible values of .
read more ..

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CoolStuffYT Dec 23, 2019

911

+1252

Downvoting Trolls

You may have seen my "Hit 1000 Score" post, where I hit 1000 score.
After that, I went past all the way to 1080.
Then I got sick, and when I logged on again for the first time in a week, I plunged down to 970.
Can we do something read more ..

off-topic

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CoolStuffYT Dec 19, 2019

911

+1252

Hit 1000 Score!

I hit 1000 score, yay

Thanks everyone on this site for helping me, especially the mods, since I joined around a year ago or so.
People have been really supportive and kind (for read more ..

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CoolStuffYT Dec 3, 2019

1053

+1252

Tough Parabola Question

Here's the question

A line intersects the parabola at points and . The line intersects the y-axis at the point . If then find .
I'm not sure how to read more ..

heureka ●●●●

CoolStuffYT Nov 27, 2019

1328

+1252

LaTeX Basic Guide

plus - minus - times \times divided \div fraction \frac{1}{2} square root \sqrt{4} plus/minus \pm power of 2^3 power of 2^{3+x} fraction {1 \over 2} box \fbox{2+2} L/R arrow \leftrightarrow Up arrow \uparrow Down arrow read more ..

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CoolStuffYT Nov 26, 2019

976

+1252

Graphs I made for Fun (September)

Hello all

In web2.0calc, as many of you know, there is something called "score."
You can get +1 score if your comment/question/post gets upvoted. read more ..

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CoolStuffYT Oct 2, 2019

1071

+1252

A lot of Questions will be Rolling in

Hello all

If you didn't know, there is a program called AoPS, and a lot of people have been question their AoPS homework questions on this forum.
I'm here to say that AoPS has started again, so we'll probably expect more questions read more ..

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CoolStuffYT Sep 5, 2019

1052

+1252

Simplifying Trig

The expression is (in degrees.)
I got 0, with the following strategy
using product identities and then
But when I plug it in a calculator it shows up as . read more ..

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CoolStuffYT Jun 15, 2019

1233

+1252

April Fool's Math Riddle ANSWERS

Please only click this if you want to see the answers.
Here are the riddles: https://web2.0calc.com/questions/april-fool-s-math-riddles

The answers are down below. read more ..

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CoolStuffYT Apr 1, 2019

+1252

Please don't post AoPS questions (or at least spam them).

Use the Message Board, or ask a friend! Only if you really need the answer, ask for hints.

PQR and PST are similar. PQ + QS = 14, and PQ = 8, so PQ is 8/14, or 4/7, the length of PS.

Same proportion for PT. PT is 10.5, and PR is 4/7 of that length. Can you find out from here?

CoolStuffYTOct 8, 2019

+1252

If triangle OPQ's side lengths are 2/3 of OMN, then PN can be split so that OP is 2/3 of ON.

Basically, OP is 2/3 of ON. Together, they make up 25 (PN).

Can you solve from here?

CoolStuffYTOct 8, 2019

+1252

We can multiply each by 5, like saying how many 0.4*5 = 2 inches in 8*5 = 40 inches?

That's easier to comprehend.

Can you solve now? How many 2 inches are in 40 inches?

CoolStuffYTOct 8, 2019

+1252

-1

Sorry ... don't know how to do this!

CoolStuffYTOct 8, 2019

+1252

You could also see that 1 = 13/15 + 10/75

However, CU and Guest's method would probably be better.

You are very welcome!

CoolStuffYTOct 7, 2019

+1252

Not sure what you're meaning....

CoolStuffYTOct 7, 2019

+1252

Hi! Welcome to web2.0calc, if you're new!

CoolStuffYTOct 7, 2019

+1252

I'm not sure if I understand this problem...

CoolStuffYTOct 7, 2019

+1252

Is there an image to show?

CoolStuffYTOct 3, 2019

+1252

LOL thanks!

CoolStuffYTOct 3, 2019

Username	CoolStuffYT
Score	1252
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Questions	34
Answers	589