- anonymous

ok, help!
3/4 - (-1/3) = I am drawing another blank
I got -5/12.. am i right? anyone?

- jamiebookeater

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- anonymous

you are not right.

- anonymous

oh no... what did i do wrong?

- anonymous

x - (-a) = x + a

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## More answers

- anonymous

so its 13/12?

- anonymous

yup

- anonymous

YAY! Thanks so much! :)

- anonymous

you are welcome.

- anonymous

-20/33 * 3/50... know the steps for this one?

- anonymous

(a / b) * (c / d) = ac / bd

- anonymous

okie dokie, let me try that. :)

- anonymous

I got 60/1650... can I simplify this?

- anonymous

yes. 60 = 10 times 6 = 10 times 3 times 2
1650 = 10 times 165 = 10 times 3 times 55

- anonymous

-2/55 ???

- anonymous

I really don't know how to do that that well :(

- anonymous

yup. -2/55 is right

- anonymous

YAYA! it just hit me. i got it! thanks to you. I'm almost 30 and havent done this is so long. and im a single momma with 2 kids in the army and never have time to study. this is sooooo much help right now!

- anonymous

If your not tired of helping yet i have a few more that are stomping me. :)

- anonymous

you are welcome

- anonymous

I would help you, but make sure you have really thought about your problem before you post it here. I can give you the answers all day, but it is better if you learn how to apply your math skills to problems, then you wouldnt even need my help. :)

- anonymous

okie dokie deal! :)

- anonymous

-13/18 divided by 20/27... dont i just flip? and then multiply?

- anonymous

yes.

- anonymous

a / b = a times 1 / b

- anonymous

so 13/18 * 27/20

- anonymous

yes

- anonymous

so, 13*27
________
18*20

- anonymous

right.
remember 18 is 9 times 2 and 27 is 9 times 3

- anonymous

i thought it was -13/18? you are missing a minus sign

- anonymous

ok, so that just makes this answer a negative right? im lost now, again..

- anonymous

yeah. -a = -1 times a.

- anonymous

so the answer i got is -39/40

- anonymous

right.

- anonymous

YAY!

- anonymous

ok, -14 minus x
------------
56
x= -14

- anonymous

huh? how can x = -14?

- anonymous

i think i got this lets see.
-14+14 28
-------- = ---
56 56

- anonymous

oh hahaha! im sorry x is -14 too.

- anonymous

so -7 3
--- = -1--
4 4

- anonymous

it is - (1 3/4)
you have to be careful with that.

- anonymous

no kidding! that one was very tricky huh?

- anonymous

no it was not tricky. I meant you have to be careful where you put the minus sign.
It should apply to the whole of 1 3/4, so we write -(1 3/4)
If it applied to just the 1, then it would be -1 3/4

- anonymous

cant believe i got it right! your a great teacher!

- anonymous

glad to be of help :)

- anonymous

so i would writh it as -(1 3/4) right?

- anonymous

yes.

- anonymous

nice

- anonymous

x*y*z*z*z*z*
write as an expotetial notation would be: xyz^4

- anonymous

yes.

- anonymous

-7s^3= -343s is this one right?

- anonymous

no.

- anonymous

is it\[-7s ^{3}\] or \[(-7s)^{3}\]

- anonymous

(-7s)^3

- anonymous

okay, then it is \[-343s ^{3}\]

- anonymous

remember, you have to cube everything in the brackets, that includes the s. You forgot to do that in your initial answer. You cubed 7 to get 343, but you didnt cube the s.

- anonymous

ohhhh! ok got cha! And im almost done! yaya! you are helping me sooo much!

- anonymous

-7x^2 + 14xy +8y^2 +5(-3x^2 + 5xy + 2y^2)
OMG!

- anonymous

okay, what is 3a + 5 a?

- anonymous

8a

- anonymous

okay good. so what is 3x^2 -15x^2

- anonymous

ummm, 9x - 225

- anonymous

x^2 is just another variable.
suppose you put a = x^2, then 3x^2-15x^2 becomes 3a -15a = -12a.
but a = x^2
so 3x^2-15x^2 = -12 x^2

- anonymous

OHHHHH!

- anonymous

ok let me see what i can come up with.. :)

- anonymous

still struggling...

- anonymous

treat all of them like variable. say x^2 = a, xy = b and y^2 = c.
write it in terms of a,b,c and then substitute them back as x^2,xy and y^2

- anonymous

-7a - 3a + 14b + 5b +8c + 2c=
like this?

- anonymous

you forgot to multiply the last three terms by 5.

- anonymous

-4x^2 + 19xy + 13y^2(5)

- anonymous

no! no no!
-7x^2 + 14xy +8y^2 +5(-3x^2 + 5xy + 2y^2) = -7x^2 + 14xy +8y^2 -15x^2 + 25xy + 10y^2)

- anonymous

5(a+b+c) = 5a + 5b + 5c

- anonymous

oh boy.. and now I have to go. :(

- anonymous

will you be on here at all tomorrow?

- anonymous

I wish I could stay on all night but these kids have to eat and get baths and to bed. thank you so much! you have been sooooo much help! I am gonna look for ya tomorrow and hope i get lucky!

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