Math Is Fun Forum

ninjaman

Member

Registered: 2013-10-15

Posts: 61

not sure of the answer

hello
i have a problem  i have this

I =  5*10^-5/1+(2*10^-2) * s = ?

i dont know s, that shouldnt matter.

i think this equals (5*10^-3) 1/200+s

i have done this on latex but cant post it so this will probably look weird, its laplace transform.
i have to rearrange to find I
any help would be great

thanks

simon

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: not sure of the answer

Hi;

Put your latex between the math tags.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

ninjaman

Member

Registered: 2013-10-15

Posts: 61

Re: not sure of the answer

hello

thanks for that bobby

is this right?

thanks
simon

Last edited by ninjaman (2015-04-30 00:44:15)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: not sure of the answer

Hi;

I am not getting that, please check you calculations.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

ninjaman

Member

Registered: 2013-10-15

Posts: 61

Re: not sure of the answer

hello

im not actually sure how to work it out. i have to rearrange it somehow. is there a name for that process.
the bottom part is supposed to be the top rearranged to be able to find I
i dont know how to do this. a little hint would be good

thanks
simon

i just had another look and i think that it is 1/50 instead, not 1/200
otherwise the rest is the same

Last edited by ninjaman (2015-04-30 02:48:57)

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: not sure of the answer

Hi;

You should get:

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

ninjaman

Member

Registered: 2013-10-15

Posts: 61

Re: not sure of the answer

thankyou for you help bobby, please could you explain how you got this. what is the process called so I can look it up.

thanks
simon

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: not sure of the answer

This is just called simplification. Want to see if we can do it?

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

ninjaman

Member

Registered: 2013-10-15

Posts: 61

Re: not sure of the answer

i have just looked at simplification and cant seem to find anything that looks like the problem i have.

i did 1/400 on the calculator and pressed the S<>D button and got 0.0025 which i can rewrite as 25x10^-3 which is what i have to show.

i still don't understand how to do this.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: not sure of the answer

Hi;

Did you try to multiply the top and bottom of your fraction by 50?

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.