Membres: CoolStuffYT

36 Questions
601 Answers

669

+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 lire plus ..

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CoolStuffYT 6 janv. 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 lire plus ..

Hors sujet

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CoolStuffYT 20 juin 2020

887

+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 lire plus ..

Hors sujet

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CoolStuffYT 17 juin 2020

831

+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

Hors sujet

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CoolStuffYT 26 mars 2020

970

+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. lire plus ..

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CoolStuffYT 22 mars 2020

933

+1253

Optional Survey

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

Hors sujet

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CoolStuffYT 5 févr. 2020

967

+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 lire plus ..

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CoolStuffYT 1 févr. 2020

933

+1253

Rational Function Equations

Let and be real numbers such that and
.
Find all possible values of .
lire plus ..

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CoolStuffYT 23 déc. 2019

965

+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 lire plus ..

Hors sujet

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CoolStuffYT 19 déc. 2019

969

+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 lire plus ..

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CoolStuffYT 3 déc. 2019

1095

+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 lire plus ..

heureka ●●●●

CoolStuffYT 27 nov. 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 lire plus ..

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CoolStuffYT 26 nov. 2019

1016

+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. lire plus ..

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CoolStuffYT 2 oct. 2019

1107

+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 lire plus ..

Hors sujet

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CoolStuffYT 5 sept. 2019

1104

+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 . lire plus ..

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CoolStuffYT 15 juin 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. lire plus ..

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CoolStuffYT 1 avr. 2019

+1253

-2

There are 16 because there are 16 divisors of 1000.

You are very welcome!

CoolStuffYT19 mars 2019

+1253

Why?

CoolStuffYT19 mars 2019

+1253

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

CoolStuffYT18 mars 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.

CoolStuffYT18 mars 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!

CoolStuffYT18 mars 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!

CoolStuffYT18 mars 2019

+1253

The red is equation 1 and blue is equation 2.

Can you find the transformation?

You are very welcome!

CoolStuffYT18 mars 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!

CoolStuffYT18 mars 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?

CoolStuffYT12 mars 2019

+1253

-1

No, why?

CoolStuffYT12 mars 2019

Nom d'utilisateur	CoolStuffYT
But	1253
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Questions	34
Réponses	589