Question

How would I write T varies jointly as r and n?

Answer 1

This is what I've got
T=krn
Not sure if that's right

Answer 2

Well that makes sense.

Answer 3

Okay so the key concept of combined variations is :
z varies jointly with x and y Equation Form: z=kxy

Answer 4

So I was right

Answer 5

Yes you are are correct :)

Answer 6

Ant other q's?

Answer 7

Yes. One second. Thanks

Answer 8

What's the format of a power function? I'm given four options and I'm not sure which one it is because I'm unsure of the format

Answer 9

A power function is a function of the form
f(x) = x^a,
where a is any real number.

Answer 10

Is f(x)=9x^(2/3) one?

Answer 11

I've got it narrowed down to that or f(x)=9x^(2/3)+27

Answer 12

Yes, I believe it would be the first one according to the general form of the function. Now later you learn of negative and positive derivates, if this is the case then the equation could be altered, but If your just learning this I would go w/ the first choice :)

Answer 13

Thanks. Do you have any problem helping me with some more? I've got my answers, just unsure if they're right. I missed this day at school

Answer 14

Go ahead, and if we can't finish just post another open q, that others can help u w/ :)

Answer 15

Thanks a bunch!

If I have y=8x^2, when x is halved, y is...

Answer 16

I have y gets multiplied by 4

Answer 17

y=(8x^2) / 2 ? that would be y= 4x^2 , but if you talking about the value of x, what happens to one half of the equation has to be balanced in accordance to the other.

Answer 18

Then, yes you would be correct

Answer 19

No, if the value of x is halved.

Answer 20

Oh, okay, good.

Answer 21

So in g(x)=6x^4
If x doubles in value... y is multiplied by 16?

Answer 22

Oh wait, divided by 16, no?

Answer 23

I'm confused

Answer 24

Remember as I stated before what happens to one half of the equation has to be balanced in accordance to the other. You can't subtract 4 from one side without subtracting from the other. So actually I'm not sure but i think you would multiply by 16 look you might want another opinion, but to solve x+4= 6 You would subtract 4 from both sides, not do the opposite of. -4 -4

Answer 25

Ok, this is why I'm confused, would doubling the value of x have the same result as halving it?

Answer 26

@radar @robtobey @jhonyy9 @Loser66 can you help??

Answer 27

Sorry g2g, but your on the right track :)

Answer 28

One of these people will come to help :) They should help u understand ur q's

Answer 29

Alright thanks

Answer 30

Anyone?

Answer 31

@radar