Member: CoolStuffYT

36 Questions
601 Answers

664

+1253

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

1652

+1253

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

884

+1253

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

827

+1253

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

966

+1253

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

929

+1253

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

964

+1253

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

931

+1253

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

961

+1253

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

964

+1253

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

1092

+1253

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

1396

+1253

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

1011

+1253

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

1104

+1253

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

1100

+1253

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

1272

+1253

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

+1253

-2

There are 16 because there are 16 divisors of 1000.

You are very welcome!

CoolStuffYTMar 19, 2019

+1253

Why?

CoolStuffYTMar 19, 2019

+1253

Yeah! Guest, that's what I got too (see my post above)

CoolStuffYTMar 18, 2019

+1253

Are the brackets around the x a floor or ceiling function? I can't tell, so I am unable to tell what it is.

CoolStuffYTMar 18, 2019

+1253

-1

Distributive property - we multiply everything in the parentheses by 3/5.

I like to multiply first, and then divide.

So, \(3(20x-60)=60x-180\) . We just multiplied 3 to 20x and -60.

Now, we can't forget the dividing by 5. Do this to 60x and -180.

Now we get 12x and -36.

Can you combine these and get the answer?

You are very welcome!

CoolStuffYTMar 18, 2019

+1253

Second one:

x^2-3x+7=x+3

x^2-4x+4=0

(x-2)^2=0

x=2

You are very welcome!

CoolStuffYTMar 18, 2019

+1253

The red is equation 1 and blue is equation 2.

Can you find the transformation?

You are very welcome!

CoolStuffYTMar 18, 2019

+1253

Let's find the chance that it *doesn't* snow.

There's a 2/3 chance for the first three days and 3/4 chance for the last four.

So... \((\frac{2}{3})^3\times (\frac{3}{4})^4=\frac{3}{32}\)

Now, \(1-\frac{3}{32}=\frac{29}{32}\) so there is a 29/32 chance it will snow at least once.

You are very welcome!

CoolStuffYTMar 18, 2019

+1253

Melody, also look at FiestyGeco. He/she has posted their entire Geometry homework on here... I am in the course he/she was in a couple years ago.

https://web2.0calc.com/questions/pls-help-due-tmrow_9

Wow, 11 questions?

CoolStuffYTMar 12, 2019

+1253

-1

No, why?

CoolStuffYTMar 12, 2019

Username	CoolStuffYT
Score	1253
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Questions	34
Answers	589