Question

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

Answer 1

you are not right.

Answer 2

oh no... what did i do wrong?

Answer 3

x - (-a) = x + a

Answer 4

so its 13/12?

Answer 5

yup

Answer 6

YAY! Thanks so much! :)

Answer 7

you are welcome.

Answer 8

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

Answer 9

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

Answer 10

okie dokie, let me try that. :)

Answer 11

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

Answer 12

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

Answer 13

-2/55 ???

Answer 14

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

Answer 15

yup. -2/55 is right

Answer 16

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!

Answer 17

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

Answer 18

you are welcome

Answer 19

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. :)

Answer 20

okie dokie deal! :)

Answer 21

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

Answer 22

yes.

Answer 23

a / b = a times 1 / b

Answer 24

so 13/18 * 27/20

Answer 25

yes

Answer 26

so, 13*27
________
18*20

Answer 27

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

Answer 28

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

Answer 29

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

Answer 30

yeah. -a = -1 times a.

Answer 31

so the answer i got is -39/40

Answer 32

right.

Answer 33

YAY!

Answer 34

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

Answer 35

huh? how can x = -14?

Answer 36

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

Answer 37

oh hahaha! im sorry x is -14 too.

Answer 38

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

Answer 39

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

Answer 40

no kidding! that one was very tricky huh?

Answer 41

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

Answer 42

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

Answer 43

glad to be of help :)

Answer 44

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

Answer 45

yes.

Answer 46

nice

Answer 47

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

Answer 48

yes.

Answer 49

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

Answer 50

no.

Answer 51

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

Answer 52

(-7s)^3

Answer 53

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

Answer 54

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.

Answer 55

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

Answer 56

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

Answer 57

okay, what is 3a + 5 a?

Answer 58

8a

Answer 59

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

Answer 60

ummm, 9x - 225

Answer 61

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

Answer 62

OHHHHH!

Answer 63

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

Answer 64

still struggling...

Answer 65

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

Answer 66

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

Answer 67

you forgot to multiply the last three terms by 5.

Answer 68

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

Answer 69

no! no no!

-7x^2 + 14xy +8y^2 +5(-3x^2 + 5xy + 2y^2) = -7x^2 + 14xy +8y^2 -15x^2 + 25xy + 10y^2)

Answer 70

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

Answer 71

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

Answer 72

will you be on here at all tomorrow?

Answer 73

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!