anonymous
  • anonymous
ok, help! 3/4 - (-1/3) = I am drawing another blank I got -5/12.. am i right? anyone?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
you are not right.
anonymous
  • anonymous
oh no... what did i do wrong?
anonymous
  • anonymous
x - (-a) = x + a

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anonymous
  • anonymous
so its 13/12?
anonymous
  • anonymous
yup
anonymous
  • anonymous
YAY! Thanks so much! :)
anonymous
  • anonymous
you are welcome.
anonymous
  • anonymous
-20/33 * 3/50... know the steps for this one?
anonymous
  • anonymous
(a / b) * (c / d) = ac / bd
anonymous
  • anonymous
okie dokie, let me try that. :)
anonymous
  • anonymous
I got 60/1650... can I simplify this?
anonymous
  • anonymous
yes. 60 = 10 times 6 = 10 times 3 times 2 1650 = 10 times 165 = 10 times 3 times 55
anonymous
  • anonymous
-2/55 ???
anonymous
  • anonymous
I really don't know how to do that that well :(
anonymous
  • anonymous
yup. -2/55 is right
anonymous
  • 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
  • anonymous
If your not tired of helping yet i have a few more that are stomping me. :)
anonymous
  • anonymous
you are welcome
anonymous
  • 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
  • anonymous
okie dokie deal! :)
anonymous
  • anonymous
-13/18 divided by 20/27... dont i just flip? and then multiply?
anonymous
  • anonymous
yes.
anonymous
  • anonymous
a / b = a times 1 / b
anonymous
  • anonymous
so 13/18 * 27/20
anonymous
  • anonymous
yes
anonymous
  • anonymous
so, 13*27 ________ 18*20
anonymous
  • anonymous
right. remember 18 is 9 times 2 and 27 is 9 times 3
anonymous
  • anonymous
i thought it was -13/18? you are missing a minus sign
anonymous
  • anonymous
ok, so that just makes this answer a negative right? im lost now, again..
anonymous
  • anonymous
yeah. -a = -1 times a.
anonymous
  • anonymous
so the answer i got is -39/40
anonymous
  • anonymous
right.
anonymous
  • anonymous
YAY!
anonymous
  • anonymous
ok, -14 minus x ------------ 56 x= -14
anonymous
  • anonymous
huh? how can x = -14?
anonymous
  • anonymous
i think i got this lets see. -14+14 28 -------- = --- 56 56
anonymous
  • anonymous
oh hahaha! im sorry x is -14 too.
anonymous
  • anonymous
so -7 3 --- = -1-- 4 4
anonymous
  • anonymous
it is - (1 3/4) you have to be careful with that.
anonymous
  • anonymous
no kidding! that one was very tricky huh?
anonymous
  • 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
  • anonymous
cant believe i got it right! your a great teacher!
anonymous
  • anonymous
glad to be of help :)
anonymous
  • anonymous
so i would writh it as -(1 3/4) right?
anonymous
  • anonymous
yes.
anonymous
  • anonymous
nice
anonymous
  • anonymous
x*y*z*z*z*z* write as an expotetial notation would be: xyz^4
anonymous
  • anonymous
yes.
anonymous
  • anonymous
-7s^3= -343s is this one right?
anonymous
  • anonymous
no.
anonymous
  • anonymous
is it\[-7s ^{3}\] or \[(-7s)^{3}\]
anonymous
  • anonymous
(-7s)^3
anonymous
  • anonymous
okay, then it is \[-343s ^{3}\]
anonymous
  • 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
  • anonymous
ohhhh! ok got cha! And im almost done! yaya! you are helping me sooo much!
anonymous
  • anonymous
-7x^2 + 14xy +8y^2 +5(-3x^2 + 5xy + 2y^2) OMG!
anonymous
  • anonymous
okay, what is 3a + 5 a?
anonymous
  • anonymous
8a
anonymous
  • anonymous
okay good. so what is 3x^2 -15x^2
anonymous
  • anonymous
ummm, 9x - 225
anonymous
  • 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
  • anonymous
OHHHHH!
anonymous
  • anonymous
ok let me see what i can come up with.. :)
anonymous
  • anonymous
still struggling...
anonymous
  • 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
  • anonymous
-7a - 3a + 14b + 5b +8c + 2c= like this?
anonymous
  • anonymous
you forgot to multiply the last three terms by 5.
anonymous
  • anonymous
-4x^2 + 19xy + 13y^2(5)
anonymous
  • 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
  • anonymous
5(a+b+c) = 5a + 5b + 5c
anonymous
  • anonymous
oh boy.. and now I have to go. :(
anonymous
  • anonymous
will you be on here at all tomorrow?
anonymous
  • 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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