twitch 2 years ago need help!!! Medalss!!!

1. twitch

simplify -1/5 - 2/3

2. kugler97

all you would do is get a caculator and type in -1/5 - 2/3 and you will get your answer..

3. twitch

alrite hang on tell me if you get the same thing

4. kugler97

okkayy.. lol

5. twitch

-0.86666666666666666666666666666667

6. twitch

lol

7. twitch

did you get the same thing

8. kugler97

yes i did.. lol

9. twitch

but I dont thinks thats right

10. kugler97

It is -0.86 you take the rest of the numbers off.. lol

11. twitch

oh how would I put that in a fraction tho :)

12. kugler97

you would take -0.86 and divide that by 100 and then tell me what you get ?!

13. twitch

0.0086

14. kugler97

i just did it and i got 0.0086

15. twitch

so when does it become a fraction

16. kugler97

then take that and put 86 over 100 and that's your answer (:

17. kugler97

is it right?

18. twitch

umm idk because my cousin got $-\frac{ 13 }{ 15 }$

19. kugler97

hmmmm... not sure then sorry

20. twitch

its okay thnx for trying

21. kugler97

22. twitch

wbu tomo do you know how to do this problem

23. Twis7ed

Find the greatest common denominator and simplify

24. tomo

-1/5 - 2/3 multiply the first term by 3/3. you need a common denominator to add or subtract fractions. in this case the least common denominator is 15 (-1/5)*(3/3) = -3/15 multiply the second term by 5/5 (2/3)*(5/5) = 10/15 $\frac{-3}{15}-\frac{10}{15} = \frac{-3-10}{15} = \frac{-13}{15}$

25. twitch

alright hb $\frac{ 8k-12h }{ 4 }$

26. tomo

pull out a 4 out of the numerator.

27. twitch

-4kh

28. tomo

??

29. twitch

8-12 is - 4?

30. twitch

oh nvm its 2k-3h

31. tomo

good catch.

32. twitch

duuhh immma dork sometimes

33. tomo

now you have $\frac{4*(2k-3h)}{4} = \frac{4}{4}*(2k-3h) = ?$

34. twitch

1kh

35. tomo

k and h are not multiplied they are being subtracted so you have (4/4)(2k-3h) 1*(2k-3h) (2k-3h) you cannot simplify further 2k-3h does not equal 1kh suppose you have k = 2, h = 3 2k-3h = 2*2-3*3 = 4-9 = -5 1kh = 1*2*3 = 6 // clearly not -5

36. twitch

okay I have no idea how to solve this one "a bowl contains 4 red chips, 3 blue chips, and 9 green chips. your choose one a random" Find P (not red) now how would I solve this?

37. tomo

P(not x) = 1-P(x)

38. twitch

wait how did you figure that

39. tomo

you have a total probability of 1. therefore the P(x) is something then the probability of not x is 1 minus the probability of that something.