HOMEWORK help center ||HWH||open!

[WastedSpace]

Thank you so much! I struggle in physics more than chemistry, but my school doesn't have any tutors for my physics class. My teacher doesn't even have office hours since he works at three different schools. I've been using Khan Academy to get extra help, but for some reason these specific physics problems are giving me some issues.

For chemistry I do have a tutor (my professor doesn't really teach and the book doesn't always make thing clear), but she wasn't able to meet up with me, thus I have been trying to figure out how to do the problems on my own. The few questions I have asked here has actually helped me get an 85% on the homework since I understand a lot more with what I am doing <3 I really appreciate all the help <3 A lot of times when I look at how people do the problems online, they don't really fully explain it in a way that I understand, but both of you explained things in a way that I did understand.

I've been a TA for several classes and there are too many people who simply don't go in and ask, so I always have to encourage people to do so.

I HAVE A QUESTION!
TYPE OF QUESTION:
English/History
YOUR QUESTION:
Okay, for my English class, I'm supposed to write a children's story book on the colonization of the Igbo people. One problem: I can't find one definite answer from any sources, not even Wikipedia. It seems that no one quite knows. It's starting to really frustrate me, and I was wondering if anyone could direct me to some good sources for this kind of subject? Thank you!

I went poking around out of curiosity and am a little confused - what information did you find that was conflicting? o.o

Just some advice, though:
- When a group does a bad thing, they will always try to hide and convolute what they did, so when dealing with history, you're always going to have to wade through conflicting or confusing information to get to the root of the story.
- Use your common sense.
- Look for common pieces of information throughout different sources, as those are likely to be true or have a grain of truth.
- Keep in mind your end goal of looking for this information. Tbh, for a children's book, generalities are probably fine.
- Utilize Google Scholar to find more legitimate sources. If you get stuck, change up your keywords.
- It's okay to present multiple stories and say which one seems more likely but that it is unknown now which actually happened.
- If you've got the time, hit up your school and/or local library and see if you can find any good book resources.
- If you're really unsure and stuck, talk to your teacher about it. Be prepared to present what you've found so far so they know you have put in work and they can help you work around the problem you're having.

[Amelia]

I HAVE A QUESTION!
TYPE OF QUESTION:
Math
YOUR QUESTION:
Find h. I've done this before, but I've missed a few days of school recently and have a test tomorrow!

[TheFae]

I HAVE A QUESTION!
TYPE OF QUESTION:
Math
YOUR QUESTION:
Find h. I've done this before, but I've missed a few days of school recently and have a test tomorrow!

Hiya! So the lovely thing about triangles is that most of them can be compared with ratios! Because the angles are the same, we can compare the sides to each other.

Meaning
big bottom / big left side
is equal to
small bottom / small left side

plug in your variables, cross multiply, and divide to find h!

Hopefully this clarifies things!

hint: h should come out to be 5.25!

[WastedSpace]

I HAVE A QUESTION!
TYPE OF QUESTION:
Math
[b][u]YOUR QUESTION: Find h. I've done this before, but I've missed a few days of school recently and have a test tomorrow!

So you've got a right angle triangle within a right angle triangle. Since they're both right angle, the ratio of the height to the base has to be the same for each triangle. Knowing this, you can set up an equation.

9/(5+7) = h/7
9/12 = h/7
3/4 = h/7

Now you just just isolate h to solve for it!

(Pretty sure that's the correct method.)

[Amelia]

Thanks! This has totally cleared it up.

[Waki]

I HAVE A QUESTION!
TYPE OF QUESTION:math (been a little confused lately)
YOUR QUESTION:

These word problems have been confusing me- I can't seem to wrap my head around it, Some help would be appreciated!

1. the sum of the digits of a certain two-digit number is 12. When you reverse its digits you increase the number by 54. Find the number

1. A plane traveled 360 miles to Warsaw and back. The trip there was with the wind. It took 4 hours. The trip back was Into the wind and it took 12 hours. What is the speed of the plane in still air? What is the speed of the wind?


Thanks lots, I just need a clearer understanding of the questions C:

[WastedSpace]

I HAVE A QUESTION!
TYPE OF QUESTION:math (been a little confused lately)
YOUR QUESTION:

These word problems have been confusing me- I can't seem to wrap my head around it, Some help would be appreciated!

1. the sum of the digits of a certain two-digit number is 12. When you reverse its digits you increase the number by 54. Find the number

1. A plane traveled 360 miles to Warsaw and back. The trip there was with the wind. It took 4 hours. The trip back was Into the wind and it took 12 hours. What is the speed of the plane in still air? What is the speed of the wind?


Thanks lots, I just need a clearer understanding of the questions C:

The first one took me forever to figure out what the second part was saying, so I completely understand!
So you have a two digit number xy where x+y = 12.
When you make it yx, yx = xy - 54.
Does that help? (If not, you can google this exact question and find some answers. ;3 )

For the plane one, go step by step and draw out a labeled picture. Here's my messy digital drawing.

a. -----> -----> -----> 4 hrs -----> -----> ----->
|---------------------360 mi---------------------|
b. <---- ----> <---- 12 hr -----> <----- ----->

where -----> = direction of wind
and <-----> = direction of travel

Does that help you get started?

[Waki]

I HAVE A QUESTION!
TYPE OF QUESTION:math (been a little confused lately)
YOUR QUESTION:

These word problems have been confusing me- I can't seem to wrap my head around it, Some help would be appreciated!

1. the sum of the digits of a certain two-digit number is 12. When you reverse its digits you increase the number by 54. Find the number

1. A plane traveled 360 miles to Warsaw and back. The trip there was with the wind. It took 4 hours. The trip back was Into the wind and it took 12 hours. What is the speed of the plane in still air? What is the speed of the wind?


Thanks lots, I just need a clearer understanding of the questions C:

The first one took me forever to figure out what the second part was saying, so I completely understand!
So you have a two digit number xy where x+y = 12.
When you make it yx, yx = xy - 54.
Does that help? (If not, you can google this exact question and find some answers. ;3 )

For the plane one, go step by step and draw out a labeled picture. Here's my messy digital drawing.

a. -----> -----> -----> 4 hrs -----> -----> ----->
|---------------------360 mi---------------------|
b. <---- ----> <---- 12 hr -----> <----- ----->

where -----> = direction of wind
and <-----> = direction of travel

Does that help you get started?

Hey, thanks so much for the answer, im STILL A little confused for the first question- I tried googling it out (the teacher wants us to solve it either using substitution/elimination using two linear equations) and the googled answer I had no idea how they started out the formula// as for the second question, I understand the concept of IT, but not sure how to solve it especially with it asking for the speed of the plane in still wind (guessing not AGAINST or with). Both of the questions are to be solved using 2 diff equations and I have no idea how to fill out the numbers for them ahah

[WastedSpace]

Hey, thanks so much for the answer, im STILL A little confused for the first question- I tried googling it out (the teacher wants us to solve it either using substitution/elimination using two linear equations) and the googled answer I had no idea how they started out the formula// as for the second question, I understand the concept of IT, but not sure how to solve it especially with it asking for the speed of the plane in still wind (guessing not AGAINST or with). Both of the questions are to be solved using 2 diff equations and I have no idea how to fill out the numbers for them ahah

When writing an equation or set of equations, I find it helpful to:
- Write down everything you know about the problem, including what you want to find
- Sort out your information into two columns: known and unknown
- Determine what you want to find
- Start connecting the dots

1. the sum of the digits of a certain two-digit number is 12. When you reverse its digits you increase the number by 54. Find the number

Did you check more than one google result for this one? I saw several that showed you how to get the equations, even though the examples were different. ;3

So you're looking for a number, n. Let's make the 10s column represented with x and the 1s column represented with a y.

Now you know what x and y equal added up, so there's one equation:
a) x + y = 12

Here's the one you have to think about and why you need to separate these numbers into the 10s column and the 1s column. You know that when you reverse the digits (ie, yx instead of xy), you increase the original number, n, by 54. So, make that an equation:
b) 10y + x = 10x + y + 54
10x + y is your original number, which is an increase of 54 above your reverse number: 10y + x.

Now let's simplify each equation and let's go ahead and isolate for one variable:
a) y = 12 - x

b) 9y = 9x + 54
y = x + 6

If we look at our two equations, we can immediately see that if add them together, we can reduce our equation to one unknown and solve part of our equation, so let's go ahead and do that. a - b:
y = 12 - x
+ (y = 6 + x)
= (2y = 18)
so y = 9

Now that we know one of our variables, we can go back and put y into either of our equations and figure out x.

a) x + 9 = 12
x = 3

Just to check, let's solve with b as well.
b) 9 = x + 6
x = 3

Matches up!

Now remember that we defined the 10s column in the original number as x and the 1s as y. So your original number is 39. You can double check this by subtracting the original number from reverse number, which should give you 54. 93 - 39 - 54. You've found the answer and confirmed it!

1. A plane traveled 360 miles to Warsaw and back. The trip there was with the wind. It took 4 hours. The trip back was Into the wind and it took 12 hours. What is the speed of the plane in still air? What is the speed of the wind?

Alright, now try using the same steps we used above here: define your knowns and unknowns and start putting them in equations. (By the by, I tried googling this one as well just to see and there are plenty of examples out there that should help you figure out your own steps here!)

We have two speed unknowns: the plane's speed and the wind's speed. We know we need to find both. We also know that the equation gave us how long the trip took with the wind and against the wind. Therefore, we have some idea of how we can set up our variables.
Our basic unknowns are:
y = speed of the plane
x = speed of the wind
So now we can manipulate these to match the information we've been given:
y + x = speed of the plane with the wind (a)
y - x = speed of the plane without the wind (b)

In order to put together our next piece of information, let's look at units really quickly. Speed is distance over time. Both y and x are speed variables, so they have the same units. That means that whatever goes on the other side of our equation has to have distance over time units. And look! We have both a distance (360 mi) and a time (4 hours and 12 hours)! So, we just have to divide these to get our speed.

Now that we've got our variables sorted, let's start putting in known information to flesh out our equations.
a) y + x = 360 / 4
y + x = 90
b) y - x = 360 / 12
y - x = 30

Now that you've got your equations, can you figure out how to solve? It'll be pretty similar to what we did for the previous equation! (Actually, you should be able to solve it the same exact way now.)

[Greenleaf]

I HAVE A QUESTION!
TYPE OF QUESTION: IB standard level chemistry, but honestly it could apply to other subjects, too.
YOUR QUESTION: does anyone have any tips on how to find peer reviewed sources that are both free and easy to read? It's my own fault for leaving it to the last minute, but my chem teacher needs us to have at least four peer reviewed sources in our bibliography for a project and I can't find any sources anywhere. I've tried JSTOR and Google Scholar and plenty other strange websites but the articles that look helpful are all locked and the articles that are open access are illegible to me. ;-;