/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.

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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.

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*sub*

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* 2 300*H becomes

`300`

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## Useful Symbols:

θ μ ← ↑ → ↓ ↔ ↨ ω α ∴

**Basic Math:** ≠ ≈ ≥ ≤ ± ∓ × ⋅ ÷ √ ‰

**Geometry:** ∠ ∟° ⊥ ∥ ≅ Δ π

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

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

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/r/HomeworkHelp

1

0 Comments

2024/04/07

14:28 UTC

14:28 UTC

0

Could anyone help do and explain this physics question for me please?

1 Comment

2024/04/07

13:36 UTC

13:36 UTC

4

5 Comments

2024/04/07

13:31 UTC

13:31 UTC

0

0 Comments

2024/04/07

13:21 UTC

13:21 UTC

1

I can’t for the life of me figure out what this is asking me to do

1 Comment

2024/04/07

13:00 UTC

13:00 UTC

1

I thought that, when entering, the disk creates a magnetic field in the opposite direction of the existing field (Lenz), which then results in a change of flux through the coils in such a way to create an induction current in the same direction as the current that was already flowing through the coils --> the battery can decrease its voltage.

But I am really not sure so I would like some help

1 Comment

2024/04/07

12:39 UTC

12:39 UTC

1

I have a history assignment and I NEED sources from the 1992 summer olympics in Barcelona regarding any comment or Indication or reference to it being Czechoslovakias last year competing as a whole if anyone has any source it would be an amazing help even a website that helps finding legit sources I’m just really struggling finding any at this point.

1 Comment

2024/04/07

11:48 UTC

11:48 UTC

0

The data is supposed to show that one group had a higher than normal 30 day prevent. hosp., but I am not too sure how to interpret this data from the table?

No idea what Reduced Form or IV estimate is, and unsure what mean dep variable and SD dep variable values mean here?

1 Comment

2024/04/07

11:43 UTC

11:43 UTC

2

4 Comments

2024/04/07

11:40 UTC

11:40 UTC

1

So i asked here for ideas before too and I've somewhat come up with a story but I'm stuck on two paths i could take and need to know which works better and how.

Basically the MC has met a girl that he fell in love with and eventually saved her life by changing her fate but it ends up badly because:

A. she turns out to be a bad person (picture johan from monster, that kinda trope) and he has to kill her to correct his mistake. what i need is what does she do that's so bad that she deserves to die for it or to prevent more of it.

B. she ends up killing him in the near future. I wanna go with this because it brings my story to a full circle but i cant come up with a way to connect her to the MC in a way where she would kill him. need help with that.

Which of these is better and how do i fill the gaps. please help T.T

1 Comment

2024/04/07

10:48 UTC

10:48 UTC

1

Hello,

Considering the following figure, it is given that H = 3 m, and we know that the convective resistance is equal to **Rconv1 = 1/h1A1**, where A1 is the surface. Nevertheless, it is said that the Rconv1 here would be **Rconv1 = 1/h1H** which I fail to understand. Is the formula right or there's a mistake? It is not given to us any kind of geommetry specifications except H.

Thank you!

1 Comment

2024/04/07

09:48 UTC

09:48 UTC

5

The question is: “find the one(s) with 5 unpaired electrons” (so we’re working with orbits in chemistry), I found Co^2+ but my book says that Fe^3+ is also a solution. Is this right? My professor is well known for not giving the right solution so wanted to check.

Sorry if it doesn’t make sense my english is not that good

8 Comments

2024/04/07

09:35 UTC

09:35 UTC

1

I don't know how should I solve this problem...

1 Comment

2024/04/07

09:30 UTC

09:30 UTC

3

Hello Everyone!

My friend recently sent me a problem but it’s blurry, so I can't fully tell what it says. I got most of it but it isn’t right. Does anyone know what the conjecture is? I tried brute forcing it through Desmos to no avail, but I know he missed the second summation symbol on the right side. Thank you!

2 Comments

2024/04/07

07:11 UTC

07:11 UTC

1

I don't get what this question is saying...

Is the effective minimum wage a wage floor (similar to a price floor)?

Is it like the opposite of when demand is inelastic for a product, increase in price will decrease the quantity demanded but increase the TR...

1 Comment

2024/04/07

05:44 UTC

05:44 UTC

0

Lets say there is a bystander on the road watching a collision. truck 1 is traveling east at 60 km/h and another truck from behind hits the first truck with an Impact velocity of 65km/h. In this scenario would the bystander observe the impact speed to be 65km/h or 125 km/h? What about the people in truck 1, would they see the impact velocity of only 5 km/h or 65km/h still?

2 Comments

2024/04/07

05:26 UTC

05:26 UTC

1

Which stats to choose for my experiment.

Hi, I'm currently running an experiment with plant and 3 different fertilisers. Briefly, I am using 1 type of plant, and for each fertiliser, they are exposed to different dosages of fertiliser (0g, 10g, 20g, 30g, 40g N). My aim is to,

(i) Determine for each fertiliser, which dosage is the best for the plant.

(ii) Between the 3 fertiliser, is there any difference.

For this, I am assuming that my independent variable would be dosage of fertiliser and types of fertiliser. My dependent variables collected are: plant weight, leaf number, height, surface area, colour.

Was thinking if I should do one-way anova for (i) before using the best to do (ii). Or conduct a two-way anova? Would appreciate any advice as this is my first time approaching this type of experiment. Thank you in advanced!

1 Comment

2024/04/07

02:59 UTC

02:59 UTC

1

Any advice on what to add or how to organize my paper?

I currently need to write a ten page paper for sociology on substance abuse, and I’m not sure how to structure it. I started by explaining what substance abuse is and how society affects it. I talked about social control and stigmas on the issue.

3 Comments

2024/04/07

02:29 UTC

02:29 UTC

1

Hello, I am tasked to write out a policy report covering an issue in which I am to propose possible policy actions. Is it okay to format the report entirely with bullet points?

I have made policy reports for other courses in which I was able to only use bullet points, however, the length needed was only 2-3 pages. This specific assignment is requiring me to write 6 pages single-spaced. I have tried emailing the prof, but he is not responding.

3 Comments

2024/04/07

02:29 UTC

02:29 UTC

0

How can I edit this map to put dots and names on it?

6 Comments

2024/04/07

00:50 UTC

00:50 UTC

2

5 Comments

2024/04/06

23:26 UTC

23:26 UTC

1

11 Comments

2024/04/06

22:14 UTC

22:14 UTC

1

For my university assignment I have to find this date of this article: https://www.nature.com/articles/d41586-024-00232-3 .

I have looked in Pubmed, Web of science and journal citations reports and have only found the article in Pubmed. But i have no clue how to find this data, any ideas?

Thanks in advance!

1 Comment

2024/04/06

22:13 UTC

22:13 UTC

0

5 Comments

2024/04/06

21:19 UTC

21:19 UTC

0

I am writing this topic for my IB math HL IA (namely optimal angle/ point to hit the initial pool ball at), however, the topic I chose is closely related to physics. I tried googling this, and while there is information on collisions between two pool balls, there is little on the behavior of multiple, in the specific pool triangle arrangement.

Suppose you have a standard triangle rack of billiard balls under ideal conditions (all balls are touching and identical, no friction, and all elastic collisions, ect). Suppose force F is applied to the top of the triangle (just like in most normal matches of pool), at some angle.

How exactly is the force distributed then amongst the balls? If the force were to be perpendicular, I assume that the force is evenly distributed amongst each point of contact, so each ball has equal velocity in the second layer of 2 balls. However, how does this generalize for all angles?

It seems that no matter how the first ball is hit, the points of contact between the first ball and second ball remain the same (at 30 degrees relative to the perpendicular angle), and thus the direction of the force remains at 30 degrees. I vaguely know the assumption that when a ball hit another, the ball goes perpendicular to the point of contact of the hit, explaining why the balls in the last line always go at 30 degrees.

But from this, I feel as though this slightly contradicts the asymmetrical force distribution seen. If the direction of the force is always converted to 30 degrees regardless of the initial direction, then why is the force distributed at differing points accounting for direction (as in, suppose an angled shot has a y-component to it as well. Under this assumption, wouldn't the y-component get converted along with the x-component into a completely unrelated angle upon the second layer of collision? How come there being a y-component seems to "favor" the force distributions?)

Another related question is how exactly is force "distributed"? I would greatly appreciate resources or an explanation as to how energy is distributed between balls touching multiple points. For example, the first ball is touching the two balls on the row below, and when the force is applied, it would then "bounce" back. But in what proportion? Would it be 1/3 of F as it has two points of contact with the other balls? How would this work during energy transfer in the third layer, where the middle ball has two points of contact, while the side balls only have 1? I notice that the y-components of the middle ball cancel out into a lesser y-component. How would conservation of momentum work in this case?

In online simulators, it seems the white cue ball "bounces off" the stationary ball when they hit. However, when the force is propagated through the triangle, you technically have balls with force at the front, applying force to the stationary balls at the back of the triangle just like the white ball. However, this does not result in a "bouncing" pattern to happen, rather the balls in the triangle all go the same direction. Is there any explanation as to why this doesn't occur when balls are touching?

I would appreciate if you guys can provide some calculations or formulas as to proving these types of problems, or possibly essays/articles/papers specifically on this topic

Sorry if this is a basic question, I only learned of one dimensional collisions in physics a while ago, while I am doing this for a (honestly poorly chosen) topic for a math unit on vectors.

1 Comment

2024/04/06

20:07 UTC

20:07 UTC

0

i can show you my instruction paper, it has measurements of what is needed in the drawing but I have a hard time visualizing and starting it out and my anxiety is going up and giving me a hard time concentrating

2 Comments

2024/04/06

19:54 UTC

19:54 UTC

1

0 Comments

2024/04/06

19:29 UTC

19:29 UTC

1

Can I implicitly differentiate lny=sin^3 (3x+4) to find dy/dx??

I know you could just use e to get rid of the natural log but I am wondering.

5 Comments

2024/04/06

19:06 UTC

19:06 UTC

1

I badly need help with my research paper. Could you please advise me on the formulations or methods for preparing Carbopol 940 with a 3% ethanolic extract of okra (e.g., 1081 ml), while using 1% Carbopol? Also, could you explain how to adjust the Carbopol to achieve the desired concentration? By the way, I'm not a pharmacy student, so this is new to me.

3 Comments

2024/04/06

18:58 UTC

18:58 UTC

1

X=R² and d is metric of jungle river and (3 -1/n , 2) --> (3,2) (n-->oo)

I used the formula |x1-y1| +|x2|+|y2| since (3-1/n)≠3. but it gave me

1/n +4 --> 4 ≠0, so it seems like (3,2) is not a limit of (3-1/n, 2) but I think I've made a mistake of some kind here.

if I have used the second formula |x2-y2| then it would give me 0 but I think it would be wrong since (3-1/n)≠3, but I could be mistaken since 3-1/n in infinity ""would be"" 3

2 Comments

2024/04/06

18:38 UTC

18:38 UTC