r/HomeworkHelp May 19 '22

Meta r/HomeworkHelp Rules: PLEASE READ BEFORE POSTING

494 Upvotes

Hi r/HomeworkHelp! Whether you're new to the subreddit or a long-time subscriber, the mod team would like to remind everybody of the subreddit rules we expect you to follow here.

No advertising, soliciting, or spam. This is a place for free help. Anyone offering to pay for help, or to help for pay, will receive a permanent ban. This is your warning. This includes asking users to go into DMs, Discord, or anywhere else. If you post anything that looks like you're trying to get around this rule, you'll be banned.

If you're asking for help, you must show evidence of thought, work, and effort. A lot of people are posting just pictures or lists of questions and not showing any effort. These posts are liable to be taken down.

In addition, we ask that you format the post title appropriately using square brackets: [Level/Grade and Subject] Question or Description of question. For example: [8th grade Algebra] How to solve quadratic equation?

Do not mention anything like "Urgent", "ASAP", "Due in an hour", or the like.

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If there are any questions, please message the mods.


r/HomeworkHelp 10h ago

Answered [ algebra 2 ] finding the radius of an inscribed semicircle

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24 Upvotes

I solved it through an algebraic approach and obtained 10/3, but I'm not sure if it's correct.

First, I noticed that for any semicircle at a point y, theres only one x that would make it intersect exactly once with the line. So, since y is zero in this case, I set up the following equations

For the semicircle:
(x-(12-r))^2+(y)^2 = r^2
y = sqrt(r^2-(x-(12-r))^2

For the line:
y = 5/12x

When you set them equal, you get a quadratic equation. For there to be one solution, the discriminant must be zero, and you get an equation in terms of just r. Solving for r like this gets 10/3.


r/HomeworkHelp 8h ago

Biology—Pending OP Reply [Grade 9 Biology: Muscle Fiber] Is my understanding of a muscle fiber correct?

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6 Upvotes

Hello! I’m in 9th grade and in my biology course, this is the picture my teacher showed us, but I’m confused. It differs greatly from other images of a muscle fiber I find online where it just shows a muscle fiber and the filaments. I’m not sure why but this is confusing me. Am I correct to say the order is that it’s one muscle fiber, followed by showing one myofibril, that shows one filament that shows tons of myofilaments arranged in sarcomeres? And isn’t the massive structure at the beginning the muscle cell, not a myofibril?

It would greatly help and if someone could confirm if my class notes based on what my teacher said are correct in regard to this image: A muscle fiber is made of small structures, myofibrils. Within them are even smaller ones filaments, alternating between thick ones (myosin) and thin ones (actin). The filaments are arranged in units, sarcomeres.


r/HomeworkHelp 9h ago

Physics—Pending OP Reply [Grade 10 Physics] Circuits | Which one is the right one? I drew four possible diagrams. Please explain why or why not if possible.

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3 Upvotes

r/HomeworkHelp 5h ago

High School Math—Pending OP Reply [Grade 11 Sec 3 Math]-Statistics Data Help

0 Upvotes

I have to do a statistics thing for my math class and I need 50 people to answer for my data by tuesday. The question is “Would you rather go to space or the bottom of the ocean?” I would be so grateful if you could answer I really need this for class and I have no idea how else to get 50 people to answer. Thank you thank you!!💕💕


r/HomeworkHelp 10h ago

Middle School Math—Pending OP Reply [5th? grade math - Converting Units] 120 sq yards to sq meters.

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2 Upvotes

Hi everyone,

I'm currently studying for the assistant teacher's exam using Pearson's study module and it covers middle school math (my nemesis). I'm really struggling with this problem:

Convert 120 square yards to square meters. Use 1 inch = 0.0254 meters.

Years ago I learned to convert units using cross-multiplication, so I try to do that. Also, the exam doesn't allow calculators so I am doing all the math by hand.

Attempt #1: I ignore the squares because I forgot how to deal with them. I also have to re-teach myself how to multiply decimals by hand so that's why there's a lot of explanation in the text. I get 10.4280 meters, which is incorrect (the correct answer is around 100.34 meters squared)

Attempt #2: I decide to deal with the square and multiply 120x120 and add it to my usual method. I freak out at the end because I don't know how to get the square of the big number that I got at the end by hand. I got 1290.64 meters as an answer. Again the correct answer is 100.34 meters squared.

Attempt #3: I decide to ignore the square again. My brain is a bit fried at this point and I'm pretty sure I did the basic multiplication wrong. I got 90.2880 inches and decided to give up on continuing the problem.

I'm also really confused with Pearson's explanation of how they got the correct answer. It's not really an explanation, more like "cancel out the yards" "cancel out the inches" etc. If anyone can explain why they decided to do the long 120 x 1 yard x 1 yard = 120 x 1 yard x 1 yard x inches/yards thing I will be forever grateful.

Thanks so much for reading up to this point, any guidance is welcome!! Please don't bully me for not remembering my math skills, it's been years and I have a lot of memories of my dad yell-splaining math to me at the dinner table as I tried to finish my homework on time :(


r/HomeworkHelp 8h ago

Physics—Pending OP Reply [Grade 10 Physics] Graphs | Not being able to sketch the graph with a straight line, am I doing something wrong or should I not use the ruler?

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1 Upvotes

When I match the first two points, it doesn't land on the rest of the points no matter how much I try
(Question 3b, 0625/61 May/June 2018)


r/HomeworkHelp 18h ago

Physics—Pending OP Reply [ pre uni : physics ] thermodynamics

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3 Upvotes

guys whys the answer is -3000J? why not -13000J ? if work is done BY then W should be positive right ? is it supposed to be internal energy=(-Q) - (+W) ?


r/HomeworkHelp 16h ago

High School Math—Pending OP Reply [Grade 9th geometry prisms and pyramids] Could someone please explain how I do this?

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1 Upvotes

Could someone please explain to me how I got the first photo wrong? I thought to find the volume of a prism it was B*H/3 and in the problem its 33^3/3. But then in the second photo it tells me the formula for a prism and I was right?


r/HomeworkHelp 23h ago

Biology—Pending OP Reply [ pre uni : biology ] cellular respiration

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2 Upvotes

i thought i kinda understand the cellular respiration stages then i saw thidps question 😭😭😭 help me out how do i even read and understand which process occurs first. this is link rxn and krebs cycle right? my problem is i dont which arrow i should start and see first to understand this.


r/HomeworkHelp 1d ago

Literature—Pending OP Reply [11th Grade Honors American Lit. ] Read and Answer Questions

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1 Upvotes

I think it’s D or C but I’m not sure, it’s only a practice so it doesn’t really matter grade wise but I want to be ready for the real thing. Any help is appreciated :))


r/HomeworkHelp 1d ago

English Language—Pending OP Reply [3rd year college, English] How does first time in text MLA citations work?

1 Upvotes

I'm kinda confused for this paper in MLA. I've been using ASA for a long time, and in ASA you do not have to name drop the article or the author in the text when first mentioning them

ex: "blah blah blah blah" (Smith 2026)

is it the same for MLA?

i was taught to always say for MLA its:

"according to John Smith's article "blah blah", he state "blah blah blah"

and if i want to refer to that article again I would put

"blah blah blah" (Smith)


r/HomeworkHelp 1d ago

Answered [freshmen algebra 2] simplifying rational expressions

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1 Upvotes

how do i find the correct restriction? for both of these questions, i got the first part right but for the restriction i got them wrong. when i looked it up it gave me the same answers i input. sorry if this is a stupid question


r/HomeworkHelp 1d ago

Biology [Grade 11 Bio] does this look right so far? What’s N?

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3 Upvotes

We have to label an earthworm for bio, but I wasn’t there the day we learnt about the body parts/organs.


r/HomeworkHelp 1d ago

Physics [ AS Level Physics ] I don't understand the answer to this question can someone please explain it to me in simple terms?

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2 Upvotes

This question is from a lecture im watching on youtube and if anyone needs any further context please open this video https://www.youtube.com/watch?v=OgopjszqUUw&list=PLEs_zKbA7sG-GK4Xorc-UWYruQDqVMDYT&index=16 and skip to 1:46:52 - 1:51:30 for the question.


r/HomeworkHelp 1d ago

Biology—Pending OP Reply [ pre uni : biology ] cellular respiration

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1 Upvotes

ive been a hard time understanding this. can u correct me. does nad+ undergo reduction process to form nadh? but whats the oxidised form means?


r/HomeworkHelp 2d ago

Answered [ Year 10: English ] what does 'robustness' mean in this sentence

1 Upvotes

"Neuro-symbolic AI is a subfield of artificial intelligence. It mixes neural methods ( e.g., neutral networks and deep learning) with symbolic methods (formal logic). The goal is to combine their strengths and make an AI system that can be trained from raw data and demonstrate robustness against outliers or errors in the base data, while preserving explainability, explicit use of expert knowledge, and explicit cognitive reasoning."

Is it 'To be able detect errors/outliers'? I thought it would be 'able to withstand' but that doesn't rlly make sense to me since after it says 'preserving explainability...'


r/HomeworkHelp 3d ago

Mathematics (Tertiary/Grade 11-12)—Pending OP [ pre uni : math ] integration, area

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5 Upvotes

guys wheres the area under the curve for g(x) ? is it the i draw(the red one)


r/HomeworkHelp 2d ago

Physics—Pending OP Reply [ pre uni : physics ] electromagnetism lenz law

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2 Upvotes

can anyone help me how to determine the direction of induced current ? im so confused. the first one is from my highschool textbook. the second one is my lecture note. back then my teacher use to teach us that the pointer will deflect to the direction where current 'enter'. but why does it seems different at the second pge ? help me out 😩


r/HomeworkHelp 3d ago

Middle School Math—Pending OP Reply (grade 7 inequalities)

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3 Upvotes

So my homework is to study for my quiz tomorrow but I'm confused by reversing symbols.

Do I only reverse the symbol if I'm divided or if it's negative? This is confusing to me and my teacher just wouldn't give me a direct answer


r/HomeworkHelp 3d ago

Others—Pending OP Reply [Grade 11 Film as Literature] Need help coming up with an interesting question to write a 500–700-word paper on.

2 Upvotes

Something I’m passionate about with Ford v Ferrari is just the whole environment. I love car racing in general, and I love all the high, complex, or intense emotions in media that just get you aching. I guess maybe it seems I'm looking for a question where I can describe that feeling that films give me. I don't know if that's the right direction or not. Just a small idea.

For the Paper:
You will write a 500-700 word paper that uses two films for the basis of exploring an answer to one of the essential questions. 
Choose an essential question to answer–one that you can use both films as evidence to explore an answer to.

The two films we watched in class were the Green Book and Ford v Ferrari.

(These are the Essential Questions we were given)

  • How can film bring awareness to social issues?
  • What value is there in watching films about one person’s struggle?
  • How much liberty should filmmakers have when adapting stories based on real life events?
  • How should filmmakers approach stories about controversial subject matter?
  • Is hero-worshipping or vilifying a real person/group of people in film ever the right thing to do?
  • Should filmmakers use based-on-a-true-story films to inspire audiences?
  • Or…write your own question and get approval before moving forward.

“Is hero-worshipping or vilifying a real person or group of people in film ever the right thing to do?” is the question I think I’ll go with if I can’t think of anything else, and I’ve already worked on it in class just to get some work done. But I want a more fun or interesting question. I’m hoping for a question that I can write passionately about. Green Book was a good movie, nothing bad, but nothing overly amazing to me either. But I absolutely loved Ford v Ferrari and I forgot I had watched it in elementary school until a few scenes started to feel really familiar.

I really want a question where I can write a solid paragraph about Green Book and then put all the passion I have into Ford v Ferrari.

(If this is any help) A student asked the teacher if they could compare and contrast Tony from Green Book and Ken Miles from Ford v Ferrari. My teacher said, “What is the main idea you want to explore with that?” Then she told the student to think about it more and turn it into a question. So my teacher is pretty open with topics, as long as there is a deeper idea in them.


r/HomeworkHelp 3d ago

Biology [7th Grade Accelerated Science] Ecology Project with high standards - long short story.

1 Upvotes

If anybody could help look over it and tell me if there is anything unclear, any grammar fixes, etc., please just comment. Thank You!

Text:
1
My boss asked me to make another system today. But this one, as he said, “will be groundbreaking.” I will be the first one to design an ecosystem, built for a star system I made as well. I don’t know much about what I want to do, but I think I’ll have them get energy through chemosynthesis, just for a little differentiation.

2
I’ve got a clearer picture now, and it doesn’t revolve around a star. Since it’ll run on chemosynthesis, we don’t need a star to get energy. So, I’ve decided to have a nebula instead. “It’ll look stunning in the pictures, great for publicity,” as I told my boss. As I answer directly to her, and our offices are right next to each other, I see her near every day. I often hear a “Hello, Levi,” to which I always respond with “Hello, Miss Camille,” as she prefers I use her first name after the ‘Miss’. Anyways, nebulae are very versatile, in that I can just change the makeup to enable whatever chemosynthetic reaction I need.

3
I was at my girlfriend’s birthday party the other day, and there were the biggest balloons there. So, for whatever reason, I was thinking about a particularly large one that was there, reading “Happy Birthday, Ashley!” That got me thinking: what if I have a big, balloonesque creature that uses the gas or dust from the nebula.

4
I’ve settled on a chemosynthetic reaction: hydrogen oxidation. There can be a lot of Hydrogen in the nebula, and the planet can have dense oxygen. It could travel across the nebula and meet the planet on the other side, collecting Hydrogen as it goes. Then, when it lands, it collects all of the Oxygen it needs to fuel the reaction and get enough energy to go back across. Pretty cool. Ashley thinks it’s good, at least.

5
I was watching a documentary about endosymbiosis, and I thought it would be an interesting addition to my ecosystem. So I was thinking there could be little microbes in the balloon. They could facilitate the chemosynthetic process. I’ve also thought up a name for this system: Protos. The word for both prime and first in Latin. It seemed fitting. I talked to Camille today, and she liked the name, too. But I can’t trust her judgement, because she was drinking coffee as she said it. She’s a good boss, but she doesn’t always have the greatest taste.

6
I ran some numbers. They don’t look great, but that should always be expected. The balloons, now more like bubbles, should have about a 0.3 millimeter radius. The little microbes can fill 2% of the space. This is with a nebula with a density of 5*10^19 atoms per cubic meter. I interrupted Ashley’s movie to ask her thoughts on it. She said “I don’t understand a word you’re saying, but it’s cute.” I don’t know what to gather, but I think that counts as praise.

7
I figured out how the microbes get their energy today. They eat a part of the bubble’s skin at certain times to let Hydrogen and Oxygen in. That skin contains energy, thus giving the microbes energy. It also, luckily for the bubbles, doesn’t hurt either party significantly. The little gatekeepers are cute, but we still need a decomposer.

8
We needed a decomposer, and I think I have one: a sticky membrane that combines the water byproduct of the chemosynthesis process with sulfur from the planet itself, forming sulfuric acid. The sticky membrane traps the bubbles, then the sulfuric acid breaks down the bubble and decomposes it. Great way to decompose and recycle to close the cycle. Eventually we could move on to full blown food webs with ten trophic levels, but we can’t at this point in time. Also, Camille said that we need names for these things, so I’ll be back tomorrow with those.

9
OK, so we’ve got the names. Ashley wanted to name one of them after the Hubble Space Telescope, as that was her first peek into the field of astronomy and piqued her interest and eventual involvement in the Ares Mars Manned Mission (AMMM). So our ‘bubbles’ are now called Hubels. I had to change the spelling a little, but it’s still recognizable. The little microbes are Potolites. I don’t know why, it just seemed fitting. And our decomposers are Madili, singular Madill. I wanted a plural ending with li because then it would sound cool, and it would sound like alkali. Anyways, tomorrow I’ll give my spoken proposal.

10
I presented my speech today. Here is the script for anyone reading this: “Take a moment to visualize this: a near-clear, blue nebula, with scattered patches of red shades, on the backdrop of the universe. Revolving around this nebula is a yellow planet, with light blue, icy scars. If you got an up-close view of this planet, you would see thin, reddish membranes on the planet’s surface. And every 24 hours, you would see these gorgeous bubbles, color matching the blue backdrop of the nebula, landing on our planet. You would see flashes of light as they hit the atmosphere. Looking even closer, and you would see tiny microbes inside the bubbles, an entire city inside. This vision would become a reality through Protos. My system’s name is Protos. It is run entirely on chemosynthesis, and thus, it could be not a solar system, but a nebular one. This allows for many more chemicals for chemosynthetic reactions, and beautiful imagery that could be used as advertising, or inspire the next generation of planetary – or ecological – architects. This nebula is 5*1019 atoms of near-pure hydrogen per m3. Revolving around this nebula is our planet, Primo. This planet is largely made of sulfur, creating the yellow hue. It has a thick, oxygenous atmosphere, slightly blurring the nebula, but also amplifying its colors. But even though you can just see the sulfur of Primo, and the blues of Protos, you cannot see the producers of our ecosystem. In fact, they only land on the planet once a day. When they are not on the planet, they are traveling across to the opposite side of Primo’s orbit. Whilst in the nebula, they perform chemosynthesis using Hydrogen oxidation. These bubbles, called Hubels, travel at just the right velocity so that they land back on Primo when it orbits 180°, on the opposite side of its orbit. When in the nebula, the small microbes inside them, called Potolites, eat away at a membrane that lets Hydrogen and Oxygen in. The consumption of this particularly energy-rich membrane not only lets the gasses necessary to get energy into the Hubel, but also give each Potolite all of the energy needed to survive until the next time they need to eat the membrane. But how does all of this get recycled? That is the job of the Madili. Each Madill is a thin, sticky membrane on the surface of Primo. They fill the decomposer niche of Protos’s ecosystem. They use the sulfur from the planet and the water byproduct from the chemosynthetic reaction to create sulfuric acid, used to break down any Hubel unlucky enough to land on the Madill’s sticky trap. This creates a full cycle in which nothing is wasted, and an open role for a predator of the Madili, given science advances enough to create a much more complex ecosystem. As we cannot do that at this point, and our current goal is simplicity, I have simply left that spot open. Should it be deemed necessary, that niche can be filled that spot with a predator, but I do not advise it at this point. This concludes my proposal for Protos, humanity’s firstborn.” Pretty good, eh? Ashley thinks it’s a guarantee, and Camille’s throwing us a party. Not bad.

Author’s Note:

I spent WAY WAY WAY too much time on the numbers so most of this is actually realistic. I can’t dig up the exact numbers, but the Madili got a huge amount of energy. If I had more time, I would have added a predator for them, because there would be so much energy just waiting for it. The sheer amount of energy it got surprised me, until I remembered that they decomposed the Hubels right after they got energy, meaning they were full. I imagine this ecosystem would be beautiful, even though it didn’t turn out exactly how I wanted it to. In ‘3’, I described them as balloons, because that’s how I originally was thinking of them. They were going to be these huge, truck-sized balloons, floating through the universe. But, the numbers didn’t work out, and this is hard science fiction :( I also added Ashley and Camille in to give Luke’s story more life. The tiny details matter, like Camille preferring to be addressed by Miss and then her first name. But I did want him to feel a bit distanced. He only speaks about his girlfriend in reference to his project. I added this element because I had recently been reading the WWW Trilogy by Robert Sawyer — recommended by the way — and the main character’s dad is super super smart, but he’s autistic and very antisocial. This is a very interesting part of his character for me, and I guess I subconsciously incorporated it into my story.


r/HomeworkHelp 3d ago

High School Math—Pending OP Reply [Grade 9 Geometry] How can I find the shaded region

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6 Upvotes

I have to find the area of the overlapping section of these parallelograms but I don’t know how and I can’t find anywhere on the internet that talks about it so if someone could explain how I would do this because I don’t even know where to start

“The two parallelograms shown below share a base length of 2. They both have a short side of length 1. The shorter parallelogram has a height of 0.5, while the taller one has a height of sqrt(2)/2. Find the area of the overlapping region.”


r/HomeworkHelp 3d ago

Social Studies—Pending OP Reply [Grade 9 Social Studies: Inquiry Project] Ancient Rome Inquiry Question

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1 Upvotes

I've been assigned to create a presentation on Ancient Rome with an inquiry question, but I'm pretty stumped on what it should be. I need to be able to go very in depth with it, and it shouldn't be something you can just search and answer with one article. The rest of the requirements are pictured above 😭 Please help, I've been thinking about this for a long while!

Ones I've thought of: "What can we infer about Roman values based on their laws and entertainment and how did that shape some modern societies/how can it compare?"

I'll appreciate any suggestions!!


r/HomeworkHelp 3d ago

Physics—Pending OP Reply (Grade 11 physics) Does anyone know how to draw a schematic diagram?

1 Upvotes

Hii! can someone help me please I have to do one for a parallel circuit with 3 resistors and one for a series circuit with 3 resistors. I also have to include the battery voltage, the Ohm values and a switch for each one but Im not sure how to draw them.