/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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## 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:

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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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## Some possibly helpful links:

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/r/HomeworkHelp

3

6 Comments

2024/11/09

20:12 UTC

20:12 UTC

2

This is my function. It is asking me for the concavity. I have found the second derivative and found that it is concave up on (-2,0) and (2,infinity) and concave down on (-infinity,-2) and (0,2).

I can’t grasp my head around the concavity when there are vertical asymptotes at -2 and 2. Could someone explain this? Is my solution flawed?

4 Comments

2024/11/09

19:43 UTC

19:43 UTC

1

1 Comment

2024/11/09

18:00 UTC

18:00 UTC

1

I have no idea how you are supposed to convert f(x) to be it's inverse, can someone help? Only for part iii; the first 2 parts are easy for me. Or is there an easier way that I should know of? Thanks.

7 Comments

2024/11/09

17:48 UTC

17:48 UTC

1

Hey guys,

I have a question about elastic collision and final velocities.

Assume all 4 carts have identical masses, Cart A has velocity to the right, cart B is stationary, Cart C has velocity to the right and cart D has velocity to the left.

What are the final velocities of each, assuming elastic collision has taken place?

1 Comment

2024/11/09

17:47 UTC

17:47 UTC

1

I've been stuck on this question for hours. I can't find any way to get 5 different points so that I can find the values of the 5 coefficients. The 2 and 1 mark questions are fine, it's the 4 mark (2nd part of part ii) that I have no clue how to do. Anyone pls give any advice on how to do?

4 Comments

2024/11/09

17:43 UTC

17:43 UTC

1

1 Comment

2024/11/09

17:18 UTC

17:18 UTC

1

I don't get how my teacher got 0.30M for the concentration of potassium in part c. Why is what I did wrong?

0 Comments

2024/11/09

17:14 UTC

17:14 UTC

1

image link: https://imgur.com/a/9r9FVKR

I am self studying for my college entrance exams. I have never encountered these type of questions before, so I can't even begin attempt it myself. Topic to study is my priority question, someone solving it would be appreciated.

/lock

5 Comments

2024/11/09

17:10 UTC

17:10 UTC

1

Where do you even start from? This is Bull-sheep

10 Comments

2024/11/09

16:43 UTC

16:43 UTC

1

5 Comments

2024/11/09

16:40 UTC

16:40 UTC

1

0 Comments

2024/11/09

16:37 UTC

16:37 UTC

2

I see they even used a term with a (+) which wasn't initially there

5 Comments

2024/11/09

16:36 UTC

16:36 UTC

1

Hey y’all been stuck in this problem about two hours hoping someone can explain the three character clear text at the end.

Step 1. Select a Case-Sensitive Word Choose one word from the following list: • KP( 3(K • RYL • [vm • Step 2. Convert to ASCII Values Convert each character of your selected word into its corresponding ASCII value in decimal. Refer to the ASCII table • Step 3. RSA Decryption Visit the RSA Step-by-Step tool Review the RSA decryption procedure. Ensure all parameters remain at their default settings. Refresh the web page if necessary to reset the parameters. • Step 4. Decrypt ASCII Values Proceed to Step 4: Decrypt on the web page. Input the ASCII values (denoted as 'c') one at a time into the tool. Record the resultant decrypted value ('m') for each ASCII value. • Step 5. Record the Three-Character Clear Text The resulting three-character clear text is

1 Comment

2024/11/09

14:14 UTC

14:14 UTC

1

For those who doesn't speak spanish, the problem ask me to find what fonces I can apply to the box to move it without dropping it foward nor backward. All the variables are general, like "P" for the weight, "h" For the height, "F" for the applied force, "b" and "c" for the box dimensions, and "µe" for the friction with the floor.

2 Comments

2024/11/09

14:01 UTC

14:01 UTC

1

2 Comments

2024/11/09

13:55 UTC

13:55 UTC

1

Is it simply logA vs logB? Use Log10 or Ln?

9 Comments

2024/11/09

13:39 UTC

13:39 UTC

1

Given g = G*m/r^(2) = 9.8, if I have planet x with gravitational acceleration of 5g and a known density of x1.5 that of Earth, how do I represent the radius of this other planet as a proportion of earth's?

I'm pretty sure it involves rewriting density as a proportion of mass to radius and then finding a value for r and m of planet x such that g(x) is equal to 5g

I keep getting 3/10 >.<

3 Comments

2024/11/09

13:19 UTC

13:19 UTC

2

v

I dont understand why fluroine is not reduced, I asked chatgpt and it said only metals will be reduced, but then what about the exceptions like the electrolysis of brine? to this it said that water has a higher reduction potential so it reduces, but then doesnt fluroine have one of the highest reduction potentials so why is it not also reduced?

1 Comment

2024/11/09

13:00 UTC

13:00 UTC

1

Hello people of reddit!

I'm here to present you a problem I've unsuccessfully tried to solve for the past hour.

The only data here is the red OAC=35° angle and the blue OBC=60° angle. The problem asks for the green alpha=ACB angle. Note that the angle between the red and blue segments is not 90°

Everything else you see in black (except for the circle) is my attempt to solve this problem.

I think I'm missing something as there always an unknown angle. I also think my math coulb be wrong as I struggle to believe that delta' is 30°, but that might just be my poor graphics. My book gives me the result for the alpha angle and the result is 25°

So I ask you, is my math correct?

And if yes, what the heck am I missing to find alpha?

Edit: Yeah, delta' can't possibly be 30. If the angle on the opposite side were 30, which I now don't believe either, then delta' should be 60 and the two tangent should be perpendicular, but they can't possibly be due to the way the problem is built. So yeah, that must be wrong.

Thanks in advance!

1 Comment

2024/11/09

12:45 UTC

12:45 UTC

2

My only problem is the two 3's below the line in the middle of the photo

10 Comments

2024/11/09

12:29 UTC

12:29 UTC

1

2 Comments

2024/11/09

12:01 UTC

12:01 UTC

1

I've tried squaring both sides to no effect. I also expressed d(x,y) and d(z,w) individually and then subtracted the resulting inequalities, again to no effect. Please help.

2 Comments

2024/11/09

11:47 UTC

11:47 UTC

1

the last term in someone else's book is (2/3)x^3

2 Comments

2024/11/09

09:27 UTC

09:27 UTC

1

Could someone please explain what the 2kpi thing means in detail thanks

2 Comments

2024/11/09

08:52 UTC

08:52 UTC

2

why is it plus or minus 2kpi and not kpi on the second last line wouldn't this give correct values

3 Comments

2024/11/09

08:15 UTC

08:15 UTC

1

2 Comments

2024/11/09

07:48 UTC

07:48 UTC

1

part a why are the solutions choosen to be cis-7pi/10, cis-3pi/10 and cis9pi/10 would it still be correct to use cis-3pi/10, cis-pi/10 and cis3pi/10

3 Comments

2024/11/09

07:38 UTC

07:38 UTC

2

how did they go from line 1 to line 2 how did they divide the whole thing by z^-3

5 Comments

2024/11/09

07:17 UTC

07:17 UTC