Rex's Homework

Rex. · Sep 11, 2015

Calculate the gradient(s) of the curve at the point(s) where it crosses the given line.

y=2(sqrt'x')-5x+1 , y-axis.

Help!

Zwiebelchen · Sep 11, 2015

f(x) = 2(sqrt(x))-5x+1 = 2(x^(1/2)) - 5x + 1

f'(x) = dx/dy = x^(-1/2) - 5 = 1/(sqrt(x)) - 5

f'(x) for y = 0:

1/(sqrt(x)) - 5 = 0 |+5
--> 1/(sqrt(x)) = 5
--> sqrt(x) = 0.2
--> x = 0.04

f'(x) for x = 0:
--> lim f'(x) [x -> +0] = +inf

Rex. · Sep 11, 2015

Why?

f(x) = 2(sqrt(x))-5x+1 = 2(x^(1/2)) - 5x + 1

Squiggy · Sep 11, 2015

sqrt x is the same as x^1/2

Zwiebelchen · Sep 11, 2015

Squiggy said:
sqrt x is the same as x^(1/2)

Just a small correction because power operation takes precedence over division.

Wasabee · Sep 11, 2015

What do you mean by gradient of the curve?

Shadow Fury · Sep 11, 2015

You know that you can write the powers like this x² by using the (SUP) tags (the x^y) button)? It would make things much easier for you.

To stay on-topic, I'll answer this:

apcrabnightlive said:
What do you mean by gradient of the curve?

It is the amount by which y increases when x increases by 1, that's why a horizontal line means that the gradient is zero and a vertical line means that the gradient is infinite.

Wasabee · Sep 11, 2015

Shadow Fury said:
It is the amount by which y increases when x increases by 1, that's why a horizontal line means that the gradient is zero and a vertical line means that the gradient is infinite.

So this gradient is somewhat similar to a slope.

I also have this subject in my course -__-.

GhostThruster · Sep 14, 2015

'Slope' is the informal name for gradient

Rex. · Sep 15, 2015

Math function problem

Here,

h(x)= |2-3[(x-1)^2]|

Domain: -1<x<2

State the range that corresponds to the given domains.

I got 1<h(x)<10 but it is wrong. The correct answer is 0=<h(x)<10.

Dr Super Good · Sep 15, 2015

The reason is the domain of the intermediate before finding the magnitude includes 0.

-2 < (x-1) < 1
0 <= [(x-1)^2] < 4 // this is because the domain includes 0 and the square of 0 is 0 while anything above and below 0 squared is greater than 0.
-12 < -3[(x-1)^2] <= 0
-10 < 2-3[(x-1)^2] <= 2
0 <= |2-3[(x-1)^2]| < 10 // like wise, this is because the domain includes 0 and the magnitude of 0 is 0 while anything above and below 0 has a positive magnitude.

Ash · Sep 15, 2015

Merged your threads and adjusted the title accordingly.

Rex. · Sep 18, 2015

Inheritance!

So, now it's biology!

Are there any traits of co-dominance in human apart from blood types?

Shadow Fury · Sep 18, 2015

The whole science now...
As far as I know from Biology O-level, there is the sickle cell anaemia. It has codominance when there are the alleles Hb^A Hb^S. This is advantageous someway because it makes you more resistant to malaria. If there are others... I don't know.

Rex. · Sep 18, 2015

Mmm, sadly all results in google are like what Fury said... Anyone else...?

LordDz · Sep 18, 2015

Could this be one of those things? https://en.wikipedia.org/wiki/Lactase_persistence, scroll down to the Distribution category.

Ash · Sep 18, 2015

There are, but this is not a stack-exchange for your homework, Rex.

Dr Super Good · Sep 18, 2015

If you mean dominant and recessive then eye colour and ability to roll tongue. If you mean that they mix then skin colour, hair, etc.

Shadow Fury · Sep 18, 2015

Dr Super Good said:
If you mean dominant and recessive then eye colour and ability to roll tongue. If you mean that they mix then skin colour, hair, etc.

This is not codominance since the recessive allele doesn't express itself in the presence of the dominant allele. In codominance, both alleles are equally dominant.

Zwiebelchen · Sep 18, 2015

I have no clue about biology but wouldn't skin color qualify?

Black + White usually mixes to brown instead of one overthrowing the other.

Shadow Fury · Sep 18, 2015

Zwiebelchen said:
I have no clue about biology but wouldn't skin color qualify?

Black + White usually mixes to brown instead of one overthrowing the other.

There are several colours of skin e.g yellow, white, black, probably orange too etc... so this is a factor affected by the environment too, not by genes only. Codominance can happen only if it shows discontinuous variation which means that it is a factor controlled by genes only and does not have intermediates. Since skin colour is affected by the environment too, it is not possible for codominance to take place.

Ash · Sep 19, 2015

Once more, merged the threads... Rex, please try to make sure you learn from your homework and don't just ask us.

Flux · Sep 19, 2015

Ash said:
Once more, merged the threads... Rex, please try to make sure you learn from your homework and don't just ask us.

I think its fine to ask. Besides people answered him.

Shar Dundred · Sep 19, 2015

Shadow Flux said:
I think its fine to ask. Besides people answered him.

He's getting homework to do it himself (or not at all), not to let others do it. If he doesn't understand his stuff, he should ask his teachers to get the best answers and results.

Seriously, it's beyond me why all of you are so willing to do his homework for him.

Shadow Fury · Sep 19, 2015

Shar Dundred said:
He's getting homework to do it himself (or not at all), not to let others do it. If he doesn't understand his stuff, he should ask his teachers to get the best answers and results.

Seriously, it's beyond me why all of you are so willing to do his homework for him.

It is his problem if he asks here or to his teachers. I answer him to remind myself of everything I took in the past yearsl

The_Silent · Sep 19, 2015

It is irrelevant whether he gets help from us or not, what is relevant is if he learns anything.

DD Mikasa · Sep 19, 2015

Zwiebelchen said:
I have no clue about biology but wouldn't skin color qualify?

Black + White usually mixes to brown instead of one overthrowing the other.

Co-Dominance means that the kid who has a black and white parent would be have both black and white dots(like those black and white cats) what are you saying to put it in simple terms can be called merge of alleles which is one of the four events that happend in case of a crossbreding of two parents.

Flux · Sep 20, 2015

The_Silent said:
It is irrelevant whether he gets help from us or not, what is relevant is if he learns anything.

I completely agree

Rex. · Sep 20, 2015

DD Mikasa said:
Co-Dominance means that the kid who has a black and white parent would be have both black and white dots(like those black and white cats) what are you saying to put it in simple terms can be called merge of alleles which is one of the four events that happend in case of a crossbreding of two parents.

So you mean that skin colour is also in codominance?

PurplePoot · Sep 20, 2015

The_Silent said:
It is irrelevant whether he gets help from us or not, what is relevant is if he learns anything.

Which he's unlikely to if you give him all the answers.

DD Mikasa · Sep 20, 2015

Rex. said:
So you mean that skin colour is also in codominance?

Nope the only known case(by me) of Co-dominance in the human body is that of blood type.Skin colour is merge of alleles not Co-dominance.The black allel ain't strong enough to dominate the white allel so he merges with it and gives the brow skin.

Now that the bell rang into my hamster sized brain the interaction between allels in the skin case its called Incomplete Dominance NOT Co-Dominance.

Rex. · Sep 20, 2015

DD Mikasa said:
Nope the only known case(by me) of Co-dominance in the human body is that of blood type.Skin colour is merge of alleles not Co-dominance.The black allel ain't strong enough to dominate the white allel so he merges with it and gives the brow skin.

Now that the bell rang into my hamster sized brain the interaction between allels in the skin case its called Incomplete Dominance NOT Co-Dominance.

So blood type is the only one? No wonder, there's no other examples in google apart from blood types. Thanks dude.

DD Mikasa · Sep 20, 2015

Rex. said:
So blood type is the only one? No wonder, there's no other examples in google apart from blood types. Thanks dude.

Happy i helped.

Mr. Gameplay Knowledge · Sep 21, 2015

AAAAAAAAAAAA my brain,AAAAAAAAAAAAAAAAA my eyes.
Better do not read the page 1.

Ash · Sep 22, 2015

I really can't stress this enough: if you get an A for this work then that's awesome. If you get an A for this work and have no idea why, that's not awesome. Work it out for yourself. Do you agree with what Shadow Fury said? And fuck google. Seriously.

Flux · Sep 22, 2015

Ash said:
I really can't stress this enough: if you get an A for this work then that's awesome. If you get an A for this work and have no idea why, that's not awesome. Work it out for yourself, do you agree with what Shadow Fury said? And fuck google. Seriously.

It is his loss if he didn't learn anyway. Grades don't matter, what matters is if you learn something or not.

WhiteFang · Sep 22, 2015

I really can't stress this enough: if you get an A for this work then that's awesome. If you get an A for this work and have no idea why, that's not awesome.

This.Trust me Rex,it will be very bad in the end.You can't rely the hive during the exams,you're on your own then.

Do you agree with what Shadow Fury said?

Very important Rex.You can't just take everything in like a parrot.You must understand why it is that way or why not

It is his loss if he didn't learn anyway.Grades don't matter, what matters is if you learn something or not.

I agree to a extent but then again he will fail if he gets bad grades.Its true that its his loss,nobody controls his life but him

Rex. · Sep 22, 2015

Look here, I am really grateful to have you all to help me and to give me advises but please consider to read my reply.

I know I might have asked a lot of question back there and some of you all answer me back and it really help a lot.

I couldn't possibly have know that

this is because the domain includes 0 and the square of 0 is 0 while anything above and below 0 squared is greater than 0

and also what to learn in organic chemistry.

If there's someone asking like how I do in here, I will definitely help him/her with my best capability.

Isn't that what a Hive stands for? It means being helpful and deference to everyone despite their background or intelligent or attitude.

I also would like to thank everyone for their worries and advice for me (and of course Ash for merging the thread.

). Don't worry about me. If I really couldn't make it through the challenges of studying, then Hive will be my last resort for help.

Once again, thank you everyone and hope you have a great day! I won't let you down!

Shain Dundred · Sep 22, 2015

While I don't know if Hive really stands for "Helping people with stuff that's not related to modding", I think it's totally this guy's decision to ask for help with it - just as it is the decision of those, who answer. No one forces anyone to do anything.

Also, is it your or anyones concern whether or not he's using the information he obtains to learn or just to get his homework done? I don't think so. It's his life, so his decision.
I'm just saying that no one here can claim to be responsible for the decisions he makes, so no one should interfere. You want to help him? Help him. You think he's doing it wrong? Don't bother, it's not your concern.

But that's just my opinion about the whole matter.

DD Mikasa · Sep 22, 2015

Shain Dundred said:
While I don't know if Hive really stands for "Helping people with stuff that's not related to modding", I think it's totally this guy's decision to ask for help with it - just as it is the decision of those, who answer. No one forces anyone to do anything.

Also, is it your or anyones concern whether or not he's using the information he obtains to learn or just to get his homework done? I don't think so. It's his life, so his decision.
I'm just saying that no one here can claim to be responsible for the decisions he makes, so no one should interfere. You want to help him? Help him. You think he's doing it wrong? Don't bother, it's not your concern.

But that's just my opinion about the whole matter.

Glad to see you aint as "evil" as your twin....

Dr Super Good · Sep 28, 2015

You really should not be using Hive to solve your homework. We cannot help you when you sit your final exam which is pretty much the only questions that matter. Become too reliant on us and you might end up stuck in the exam.

Blightsower · Oct 1, 2015

omg how to math. my brain got crippled

DD Mikasa · Oct 1, 2015

In fact...Math aint that hard.You just need to focus and you can solve most of its problems.People this days just make math look like the big bad wolf.If you put just a little work at it,lets say praticing 1 hour and a half per day you would have no troubles with it.

Blightsower · Oct 1, 2015

Teach me math senpai

DD Mikasa · Oct 1, 2015

Empirean said:
Teach me math senpai

I am not a math teacher,but the good way is to take a math exercises book(this book arrange exercises for each math chapter i.e:equation,geometry etc) this books also show all formulas and the way how to apply and solve exercises.Keep solving exercises and try to memorise more used formulas ALSO pay attation at class.

Blightsower · Oct 1, 2015

Eh... I really want to learn physics formulas. Geometry not so much, geometry is actually easy.

Shadow Fury · Oct 1, 2015

Math is a walk in the park for me. I don't know why some people hate it or think that it's incredibly hard. Once you know the rules and did some exercises, it's a piece of cake.

DD Mikasa · Oct 1, 2015

Like i told you exercises.After some time you will rememer them without a issues.IHmm its like triggering you get used to the commands after using them for some time.

Blightsower · Oct 1, 2015

I agree.

Flux · Oct 2, 2015

Shadow Fury said:
Math is a walk in the park for me. I don't know why some people hate it or think that it's incredibly hard. Once you know the rules and did some exercises, it's a piece of cake.

It won't be a work in the park anymore when you get to more advanced topics like Complex Matrix, Differential Equations, Transforms, etc.
The hard part in those topics are learning the concept and getting an insight on what is really happening. Remember, just because you know 1+1 = 2 doesn't mean you know why 1+1 = 2

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