Have any homework problems or concepts that you are stuck on? Post a question here and the community will try their best to help! . Try to explain the problem as best and as clearly as you can. 

 

For maths, use ^2 for a number squared, so 

2^2 would be 2 squared, etc. 

 

Use / for a divide and * for a multiplication.

 

2*2=2 times 2=4

12/6=12 divided by 6 which equals 2

 

For fractions I would also use the divide sign or just say 'over'. For example

 

5 over 8+6 over 8

5/8+6/8

 

If you are asking a question that involves the date-use the preferred date setting that you usually use, but put UK or USA or whatever else next to it, otherwise people will get confused.

This goes for time zones too.

 

If your homework is some really long math problem that would take hours to write out, take a picture and upload it to imgur, then just copy and paste that into here. Easiest method. If it's not a problem but just a concept you can't wrap your head around, then you've come to the right place too! For example

 

Mike says "I don't understand Newton's first law! Someone help!" 

Then people chip in and add some insight into what Newton's first law is and how it works. 

 

Feel free to post youtube videos that help explain the topic. I know this thread seems like it's math and sciency but post any question about any subject you want, I was just using those examples .

 

But why do I need to go here instead of just googling the question? 

Sometimes googling long complex problems or long questions just doesn't work because of google, getting a solution from a real human is better. If you just google the answer you won't get anywhere, on this thread we'll try and provide insight to further your understanding of a topic so you can attempt that same question in a week and say 'hey I got it right!'

 

I'll start

What is 1+1?

 

If you want to learn maths, Khan Academy is one of the best YouTube channels to learn from. I've learned a lot from him, more than my teachers.

I love how this thread is made right after I just finished exams

 

If you want to learn maths, Khan Academy is one of the best YouTube channels to learn from. I've learned a lot from him, more than my teachers.

I've learned alot of human anatomy from there. They explain it so well.

 

Peace!

Nice, if anyone needs help in physics, maths, Spanish or English, I may be able to help out

I love how this thread is made right after I just finished exams

 

 

I've learned alot of human anatomy from there. They explain it so well.

 

Peace!

 

Me too! Khan Academy is a med student's best friend

Is anyone any good at probability? I desperately need help with this thing by the next few hours.

 

 

Thank you

Edited November 27, 20168 yr by 2 quid is good

Is anyone any good at probability? I desperately need help with this thing by the next few hours.

 

 

Thank you

Rotate those images.

Rotate those images.

I've done that

 

Edit: kh13 keeps rotating it the other way

 

Here's a link:http://kh13.com/forum/gallery/image/45034-dsc-0066/

Edited November 27, 20168 yr by 2 quid is good

Is anyone any good at probability? I desperately need help with this thing by the next few hours.

Thank you

I could help you with both I guess. But what exactly is the problem? Don't just wanna give you any answers

I could help you with both I guess. But what exactly is the problem? Don't just wanna give you any answers

THANK YOU

 

It's actually figuring out the method to use. Especially for question 3iv

 

How would you make a tree diagram, and would you multiply or add the probability?

THANK YOU

It's actually figuring out the method to use. Especially for question 3iv

How would you make a tree diagram, and would you multiply or add the probability?

Alright, I do my best! First thing you should do is turn the absolute numbers into relative ones.

For example you got 15 students out of 45 who only study Biology and Chemistry. That make 15/45, hence 1/3 or 33,33%.

When you've done that you already finished the first exercise. (But keep in mind that "study Physics" includes "study Physics and Chemistry", "study Biology and Physics" and so on. So here you need to add the probabilities.)

 

For the second one you need to know how to determine if two events are independent or not. All you need for that are the relative numbers again.

 

For number 3 you need conditional probability.

 

Okay number 4 is a bit more tricky, here you need the tree diagram:

 

You start with 7 limbs. One for each event (i.e. "only physics", "physics and chemistry",... ," only biology".) On the limbs you write down the probabilities of each event. So 5/45 for "only physics",..., 12/45 for "only biology".

Then you write 7 new limbs on each limb. So you got 49 limbs then. Again one for each event. The probablities on these limbs are different then though. First you only have 44 students left, and depending on the first limb that changes the number. For example: the very first limb for "only biology" has 12/45. The following limb "only physics" has 5/44, while the limb "only biology" gets 11/44.

When you've done that, you multiply the probabilities for each limb-pair. So "only biology- only biology" has 12/45 x 11/44. While "only chemistry - only physics" has 2/45 x 5/44.

This way you determined the probabilities of all possible pairs.

 

To solve the excercise you have to add the probabilities of all events that fullfill the conditions. So "only biology - only physics", "only chemistry - only physics" and so on.

Alright, I do my best! First thing you should do is turn the absolute numbers into relative ones.

For example you got 15 students out of 45 who only study Biology and Chemistry. That make 15/45, hence 1/3 or 33,33%.

When you've done that you already finished the first exercise. (But keep in mind that "study Physics" includes "study Physics and Chemistry", "study Biology and Physics" and so on. So here you need to add the probabilities.)

For the second one you need to know how to determine if two events are independent or not. All you need for that are the relative numbers again.

For number 3 you need conditional probability.

Okay number 4 is a bit more tricky, here you need the tree diagram:

You start with 7 limbs. One for each event (i.e. "only physics", "physics and chemistry",... ," only biology".) On the limbs you write down the probabilities of each event. So 5/45 for "only physics",..., 12/45 for "only biology".

Then you write 7 new limbs on each limb. So you got 49 limbs then. Again one for each event. The probablities on these limbs are different then though. First you only have 44 students left, and depending on the first limb that changes the number. For example: the very first limb for "only biology" has 12/45. The following limb "only physics" has 5/44, while the limb "only biology" gets 11/44.

When you've done that, you multiply the probabilities for each limb-pair. So "only biology- only biology" has 12/45 x 11/44. While "only chemistry - only physics" has 2/45 x 5/44.

This way you determined the probabilities of all possible pairs.

To solve the excercise you have to add the probabilities of all events that fullfill the conditions. So "only biology - only physics", "only chemistry - only physics" and so on.

This helped so much, thank you

HELP ME. 

Physics is something I really don't know. 

 

 

 

 

Alright, I do my best! First thing you should do is turn the absolute numbers into relative ones.

For example you got 15 students out of 45 who only study Biology and Chemistry. That make 15/45, hence 1/3 or 33,33%.

When you've done that you already finished the first exercise. (But keep in mind that "study Physics" includes "study Physics and Chemistry", "study Biology and Physics" and so on. So here you need to add the probabilities.)

 

For the second one you need to know how to determine if two events are independent or not. All you need for that are the relative numbers again.

 

For number 3 you need conditional probability.

 

Okay number 4 is a bit more tricky, here you need the tree diagram:

 

You start with 7 limbs. One for each event (i.e. "only physics", "physics and chemistry",... ," only biology".) On the limbs you write down the probabilities of each event. So 5/45 for "only physics",..., 12/45 for "only biology".

Then you write 7 new limbs on each limb. So you got 49 limbs then. Again one for each event. The probablities on these limbs are different then though. First you only have 44 students left, and depending on the first limb that changes the number. For example: the very first limb for "only biology" has 12/45. The following limb "only physics" has 5/44, while the limb "only biology" gets 11/44.

When you've done that, you multiply the probabilities for each limb-pair. So "only biology- only biology" has 12/45 x 11/44. While "only chemistry - only physics" has 2/45 x 5/44.

This way you determined the probabilities of all possible pairs.

 

To solve the excercise you have to add the probabilities of all events that fullfill the conditions. So "only biology - only physics", "only chemistry - only physics" and so on.

 

HELP ME. 

Physics is something I really don't know. 

 

 

 

 

Haven't learn most of that stuff, but for 425 km every hour

 

1 km is 1000m 

1 hour is 60 minutes

60 seconds every 1 minute

therefore since you have metres per second you have are saying "how many metres does this object cover in 1 second?" therefore dividing.

 

1000*425 divided by 60*60 (we want to know how many seconds in 60 minutes)

1000*425 divided by 3600 (60*60)

 

which comes to 118.05 m/s

HELP ME. 

Physics is something I really don't know. 

 

 

 

 

the slope question is asking for the gradient

 

y1-y2 divided by x1-x2

 

you did the x coordinate over the y, not the y over the x.

 

0-15/0-20=

-15/-20=0.75

HELP ME. 

Physics is something I really don't know. 

 

 

 

 

Coincidentally, I'm just about to go to physics now.

 

For question 8, a significant figure isn't the number of digits before/after the decimal point, it's the amount of numbers that aren't 0. (there is a proper textbook definition for this somewhere, but I don't really know it -_-')

 

So, even though it's to 5 decimal points, it's only got 3 significant figures.

 

So for question 9 when you're converting a number to standard form, you have to include all of the numbers, e.g 3300 in standard form would be 3.3x10^3. Or 0.0033 would be 3.3x10^-3.

 

For your question, just count the number of zeros and that's your power. So the answer would be 6.23x10^-3

Anyone good at VB.net?

    Private Sub BtnInsertion_Click(sender As Object, e As EventArgs) Handles BtnInsertion.Click

 

       Dim InsertionList = New Integer() {68, 50, 63, 79, 45, 37, 28}

        Dim position As Integer

        Dim currentvalue As Integer

        Dim index As Integer

 

 

   For index = 1 To InsertionList.Length

            currentvalue = InsertionList(index)

            position = index

            MsgBox(InsertionList(index))

 

            While InsertionList(position) > 0 And InsertionList(position - 1) > currentvalue This line keeps giving me an out of bounds error

                InsertionList(position) = InsertionList(position - 1)

                position = position - 1

                InsertionList(position) = currentvalue

 

           End While

 

        Next index

   

End Sub

Edited December 16, 20168 yr by Barry Bacon Allen

hey...need help with figuring out this problem http://i.imgur.com/eYcpHTU.png

 

actually guys from http://yourhomeworkhelp.org sent me this http://i.imgur.com/5ynU6W1.jpg

but 33.3 isn't among the given answers..thanks for your help

Edited December 20, 20168 yr by Stephanie Riggs