/r/HomeworkHelp

Need help with homework? We're here for you! The purpose of this subreddit is to help you learn (not complete your last-minute homework), and our rules are designed to reinforce this.

Grade 1-6 (Pri) Grade 7-10 (Sec) Grade 11-12 (Pre-Uni) University/College

We are one of the most unique subreddits on Reddit, one of the few subreddits that continually self-improve itself to make communications between a contributor and an asker as effective as possible.

Our rules are designed to help you get to the right answer, enforced by your fellow Redditors.

## Please google before posting your question

## ✅ Posts should look like this:

The title should be of the form ** [<Level/Syllabus><Discipline>and/or<Topic>] <Question>?** For example:

- [Grade 8 Math: Quadratic Equations] How to factorise ax2 + bx + c?
- [University Chemistry: Titration] What is my qs?
- [AS Level English: Essay Writing] Should all adverts be factual?

Include instructor prompts. What does your instructor want you to accomplish?

**[High School Math]**<Question>?

**Be specific about your grade**

- [Grade 8 Math]
**Help me!**

**What is your qs?**

When your question has been answered, please edit the post's flair to "**✓ Answered**".

## ❌ Not Allowed:

Copied questions without context or explanation. You must show some work or thought.

"Do this for me" posts such as posting of quizzes or lists of questions.

Posts tagged "urgent," "ASAP," "important," "due in an hour," etc.

Requests for help with cheating, plagiarism, or other violations of academic integrity; violations of copyright or terms of use; or other illegal or unethical activities.

Being a jerk. Jerks get banned.

Offers or solicitations of payment in any form. Those who spam us will be banned. No warnings.

Advertisements of any form. This includes asking for "likes," page views, or similar things.

Surveys. Take them to /r/samplesize.

**Keep in mind that we do not and will not have any sort of vetting procedure for responders. Accept answers at your own risk.**

## For citation questions, check the Purdue Online Writing Lab

## Using LaTeX:

To use LaTeX on this subreddit, use u/LaTeX4Reddit. Simply mention the bot in a comment and put the expressions that need to be rendered in code blocks, and u/LaTeX4Reddit will respond. Please contact u/Oryv if the bot malfunctions, or if you have questions on how to use it.

Custom superscript and subscripts:

~~Here's the syntax:~~

~~*_sub_* makes ~~*sub*

~~*`sup`* and ^(sup) both make ~~`sup`

~~*_sub_`sup`* makes ~~*sub*`sup`

~~*`sup`_sub_* makes ~~`sup`

*sub*

~~If you have trouble with spacing, add some blank spaces with ~~

* 2 300*H becomes

`300`

**Spoiler Tags:**

~~[text](#s) = text~~

>!text!< = text

## Useful Symbols:

θ μ ← ↑ → ↓ ↔ ↨ ω α ∴

**Basic Math:** ≠ ≈ ≥ ≤ ± ∓ × ⋅ ÷ √ ‰

**Geometry:** ∠ ∟° ⊥ ∥ ≅ Δ π

**Algebra:** ≡ ≜ := ≈ ∝ ∞ ≪ ≫ ⌊x⌋ ⌈x⌉ ∘ ∆ ∑ ∏ γ φ π

**Set Theory:** ∩ ∪ ⊆ ⊂⊄ ⊇ ⊃ ⊅ ⊖ ∈ ∉ Ø

**Calculus & analysis:** ε ∫ ∮ ∯ ∰ ∇ δ ∞

## Available Commands

- lock post
^{|OP and Valued/Notable Contributors only|}:`/lock`

- Mark post as
*—Pending OP Reply*^{|non-top level comment only|}:`**Therefore**`

,`**Thus**`

- Re-flair post to
**✓ Answered**^{|top-level comment only|}:`**Answer:**`

,`**Hence**`

- change flair
^{|Valued/Notable/Top Contributors|}:`Mod: change flair to <FLAIR NAME>`

For more commands, please see User Moderation

## Some possibly helpful links:

Pastebin / JSFIDDLE.net/ IDEOne

/r/HomeworkHelp

1

0 Comments

2023/12/01

06:52 UTC

06:52 UTC

1

This is a Self Directed Study assignment, I have had a very hard time coming up with a question to research it has to relate to one of the 4 areas above. If someone could give me a suggestion it would be much appreciated.

1 Comment

2023/12/01

06:05 UTC

06:05 UTC

1

2 Comments

2023/12/01

05:58 UTC

05:58 UTC

1

1 Comment

2023/12/01

05:56 UTC

05:56 UTC

0

0 Comments

2023/12/01

05:49 UTC

05:49 UTC

9

7 Comments

2023/12/01

04:28 UTC

04:28 UTC

1

6 Comments

2023/12/01

04:27 UTC

04:27 UTC

1

3 Comments

2023/12/01

03:46 UTC

03:46 UTC

1

Please help xd

1 Comment

2023/12/01

03:46 UTC

03:46 UTC

1

Suppose you have three production facilities that are polluting a river. Each emits 10 units of pollution. Their marginal cost functions for reducing emissions are, respectively, 𝑀𝐶1 = $3, 𝑀𝐶2 = $4, and 𝑀𝐶3 = $5. (a) If the objective is to cut emissions in half (to 15) cost-effectively, how much reduction should be assigned to each firm? (b) What would be the total variable cost of controlling these emissions? (c) What would be the total variable cost that would result from forcing each facility to control one-half of its emissions? Is this different from the cost associated with the cost-effective allocation? Why or why not?

2 Comments

2023/12/01

03:37 UTC

03:37 UTC

1

Got the answers from a friend, but I really can't figure out why the prime points have different numbers from the normal points.

6 Comments

2023/12/01

03:31 UTC

03:31 UTC

2

6 Comments

2023/12/01

03:19 UTC

03:19 UTC

9

7 Comments

2023/12/01

03:06 UTC

03:06 UTC

1

10 Comments

2023/12/01

02:37 UTC

02:37 UTC

0

5 Comments

2023/12/01

02:17 UTC

02:17 UTC

1

2 Comments

2023/12/01

02:06 UTC

02:06 UTC

1

2 Comments

2023/12/01

01:31 UTC

01:31 UTC

1

p(t) = some polynomial

p2(t) = some polynomial

p3(t) = some polynomial

is {p(t),p2(t),p3(t)} linearly independent?

Are these polynomials linearly independent in P^2 ?

for 1, I get that I would put the polynomials in a matrix and see if I can get to echelon form and that's that.

for 2, I think that I would do the same, but how do I check if it's linearly independent **in P^2**?

2 Comments

2023/12/01

01:24 UTC

01:24 UTC

1

My kid and his friend are having issues with this and it's been way too long since algebra for me Everything else is clicking except for where does that 1 come from??? (the part I'm pointing at) and why? We have the answer from using a calculator and an app, and the app explains it all pretty well but we're not understanding where the 1 is coming from and this is a 'project' where every step has to be shown not just an answer given. Can anyone help?

7 Comments

2023/12/01

01:21 UTC

01:21 UTC

1

I posted this question on MSE earlier on today, but didn't receive much luck there, posting here in case any of you guys can give me some tips.

My professor doesn't have any examples like this for us to look at, and I can't find many similar problems online. Basically I've no idea if I'm right or wrong here.

2 Comments

2023/12/01

01:01 UTC

01:01 UTC

1

In 2011, the estimated population of Canada was 34 699 000. If the government wants to use an alphabetic string using letters of the alphabet for every person in Canada. How long should the string of letters (repetition allowed) be so that every person in Canada can have a unique code?

2 marks for a correct strategy 1 mark for a correct answer

Im assuming the correct strategy would have to do with Factorials and Permutations because thats what the unit is about im just not sure where to start with this problem. Need something to get me going

4 Comments

2023/12/01

00:29 UTC

00:29 UTC

0

- there are exactly three roots
- the graph levels out at some point (does not need to be the x axis)
- f(-2)=4
- f(x) is increasing over (3,5)
- F(2) is a relative minimum
- F(4) is a relative maximum
- the degree of the function is even

1 Comment

2023/12/01

00:15 UTC

00:15 UTC

1

Hi! I was wondering if anyone would be willing to go over my research paper. For some context, we have to make an "empirical journal article" and the TA advised me to make a lot of changes to my first draft on Wednesday and I have just finished up. Unfortunately, the TA did let me know they will not be available to read through and the paper is due this Saturday. Everything is made up (like the results n such) but if interested please comment or PM me! I have it on a google doc or can send a PDF, TYIA :))

1 Comment

2023/12/01

00:07 UTC

00:07 UTC

2

I fully finished part A which I will attach here as well which yielded that the room would be 60 degrees celsius. However I am unsure of how to do part B since I tried adding the energy produced by both the original equation and the vaporization of the water produced by water and the final answer was 80 degrees (as seen in my work). I do not think this makes sense since vaporizations are endothermic and would either lower or have no effect on temperature. When you subtract the energy of the original equation and the energy produced by vaporization, the answer is about half that of the original, which I do not think makes sense either.

What can I do to get the correct answer and why would such steps yield it? My chemistry teacher gave me a very wordy answer and when I asked him for a better explanation he told me to look at our notes (which subsequently do not have any similar questions)

2 Comments

2023/11/30

23:56 UTC

23:56 UTC

2

I just have no clue how to solve these, and have no idea where to start I feel like there’s not enough information

2 Comments

2023/11/30

23:54 UTC

23:54 UTC