## anonymous one year ago CAN SOMEONE CHECK MY ANSWERS PLEASE???? 1.Which is the converse of the statement? If x is odd, then 2x + 1 is odd. If 2x + 1 is odd, then x is odd. If 2x + 1 is not odd, then x is not odd.<<<< If x is odd, then 2x + 1 is odd. If x is not odd, then 2x + 1 is not odd. 2.Simplify. -27a^4b^3/3ab –9a2b –9a3b2 –3ab -a^2/9b<<<<<<<<<<<

1. anonymous

@UsukiDoll

2. UsukiDoll

ok so the negation of the first statement is If x is NOT odd, then 2x + 1 is NOT odd. converse is flipping the statement If 2x+1 is odd, then x is odd contrapositive is the negative version of that converse statement if 2x+1 is NOT odd, then x is NOT odd

3. UsukiDoll

$\frac{-27a^4b^3}{3ab} \rightarrow = -9a^3b^2$

4. UsukiDoll

exponent laws $\frac{a^4}{a} \rightarrow a^{4-1} \rightarrow a^3$ same applies to b

5. anonymous

Thats for the second question right?

6. UsukiDoll

7. anonymous

Oh..

8. UsukiDoll

Original statement If A then B Negation If NOT A then NOT B conversely if B then A contrapositive if NOT B then NOT A

9. UsukiDoll

Original statement A = x is odd B = 2x+1 is odd If A then B if x is odd then 2x+1 is odd Negation If NOT A then NOT B if x is NOT odd then 2x+1 is NOT odd conversely if B then A If 2x+1 is odd then x is odd contrapositive if NOT B then NOT A if 2x+1 is NOT odd then x is NOT odd

10. UsukiDoll

these guys fail to mention that you can fine tune the negative versions of the statement If NOT A then NOT B if x is NOT odd then 2x+1 is NOT odd if x is even then 2x+1 is even

11. anonymous

isnt it odd?

12. UsukiDoll

I said you can refine the negative versions of the statement Negation If NOT A then NOT B if x is NOT odd then 2x+1 is NOT odd if it's not odd, then it's even.. but that can be easily disproved because 2k is even and 2k+1 is odd

13. anonymous

Alright..I understood what you told me and when I used it in the equation I get a different answer than they give in the options

14. UsukiDoll

15. anonymous

Yes I get an even but the choices are all odd

16. UsukiDoll

it's probably because they haven't realized that they can fine tune it .

17. UsukiDoll

but converse statements are usually positive ... it's the original if A then B statement written in reverse.

18. anonymous

So C should be the reverse from the original A then B

19. anonymous

Am I correct? or still way off?

20. UsukiDoll

worse.......and on top of that I gave out the definitions earlier

21. UsukiDoll

look at what I wrote earlier.

22. anonymous

So if 2x+1 is odd, then x is odd right?

23. UsukiDoll

yes

24. anonymous

So if I got that then the answer is A

25. UsukiDoll

yes

26. anonymous

YES!!!!!!!!!!!!!!!!!!!!!!!!!!!

27. anonymous

Can you help with the first question?

28. UsukiDoll

of?

29. anonymous

Sorry I meant the second question

30. UsukiDoll

it's straight forward..... you need to understand the exponent laws for a and b we know that $\frac{-27}{3} = -9$

31. UsukiDoll

if a and b are just single then it's technically $a^1$ and $b^1$ but no one writes it like that anymore

32. UsukiDoll

the same goes for -1c... professors will mark points off not because it's wrong.. because the notation is childish... so the correct way to express your answer is -c

33. anonymous

Oh really? how come?

34. UsukiDoll

they claim that you grew up from high school so now it's time to write it in college style notation

35. UsukiDoll

the same goes for simple stuff like this 7+(-7) you can't have a double sign it's 7-7 =0 again for 7-(-7). distribute that negative it's now 7+7 = 14

36. UsukiDoll

when I reached Algebra 2, I had to knock it off with writing -1c and just write -c for the simple problems, it's Algebra 1 that you need to stop writing double signs

37. UsukiDoll

and stop writing a^1

38. UsukiDoll

that's how the professors work now.

39. anonymous

You dont know how many questions I got wrong b/c this -3-3 is actually -3+3 or 5-5-4 is actually 5+ -5 + -4

40. UsukiDoll

you can't have double signs... can't have +-, -- , -+,++ . just one is allowed either - or +

41. UsukiDoll

I don't know why teachers write stuff like that...it's irritating

42. anonymous

That's how I've had it for a few tests

43. anonymous

It is reasons why I come to open study xD

44. UsukiDoll

45. anonymous

I'm a freshman

46. UsukiDoll

47. anonymous

Yeah

48. UsukiDoll

where did you get that first question? It belongs in logic and discrete math. something in the 300 level at my university

49. UsukiDoll

unless you're at a private school?

50. anonymous

No I'm home schooled

51. UsukiDoll

oh O_O... in a way that's great because public schools went nuts... you don't want to learn common core..trust me. I'm a Math Major and I hate everyday common core did to Math .

52. UsukiDoll

*everything

53. anonymous

Lmao if you dont like it then why major in it?

54. UsukiDoll

If I didn't go further in my Math Studies, I wouldn't have been able to help you.

55. UsukiDoll

xD. I said Common Core Math was awful....the stuff that makes simple subtraction crazy. my cousins, second grade and kindergarten, are stuck with it. Public and private schools have it. x(