## anonymous one year ago Did work!!!! But If you could check and see if my answers are right. Could you also show work, so I know isn't a guess.

1. anonymous

2. SolomonZelman

yes correct for #1

3. SolomonZelman

trust me I am not guessing:O

4. anonymous

Thanks, but can you show work pls.

5. SolomonZelman

Ok, $$\large\color{black}{ \displaystyle 47-(-68)=47+68=115 }$$

6. anonymous

7. SolomonZelman

yes you are correct on #2, as well. Should I show why?

8. anonymous

no its ok. the next one is how i wanted you to show work, but its ok

9. anonymous

10. SolomonZelman

Yes that is right as well.

11. SolomonZelman

12. anonymous

ok, let me draw out the next one

13. anonymous

Sorry took so long ...

14. SolomonZelman

negative × negative = positive (you are incorrect)

15. SolomonZelman

$$\large\color{black}{ \displaystyle (-23)\times(-24)=(-1)^2\times 23\times 24=23\times 24 }$$ I am just showing that for all positive number a and b, when you say: (-a)•(-b), that will be the same as a•b.

16. SolomonZelman

Now, lets perform the multiplication

17. SolomonZelman

|dw:1440471613916:dw|

18. SolomonZelman

Is everything clear, or you have any questions?

19. anonymous

Yes, and I had tht on paper but i dont understand why i didnt get that when i drew it out on paper lol

20. SolomonZelman

maybe because you counted the 1 on top of the 2 in 23 twice.

21. anonymous

Yeah.

22. SolomonZelman

I am not sure how you got 652, but as long as you understand everything now, we are good

23. anonymous

okay

24. anonymous

Needed help...

25. SolomonZelman

$$\rm :\color{blue}{D}$$

26. SolomonZelman

That symbol is division I suppose?

27. SolomonZelman

Not square root...

28. anonymous

k.

29. SolomonZelman

$$\large\color{black}{ \displaystyle 6.9~\div~0.03 }$$

30. SolomonZelman

Say you have some fraction: $$\large\color{black}{ \displaystyle \frac{A}{B} }$$ So you can multiply top and bottom by some number, and the value doesn't change. In other words, $$\large\color{black}{ \displaystyle \frac{A}{B}=\frac{A\times x}{B\times x} }$$

31. SolomonZelman

do you agree?

32. anonymous

Yes.

33. SolomonZelman

Similarly, in our case: $$\large\color{black}{ \displaystyle \frac{6.9}{0.03}=\frac{6.9\times 100}{0.03\times 100}=\frac{690}{3} }$$

34. SolomonZelman

I am sure you can divide 690 by 3 in your head, without even involving a paper.

35. anonymous

230

36. SolomonZelman

Yup

37. anonymous

38. SolomonZelman

39. anonymous

It's a total of 20 questions, if you find this too much, you can tell me.

40. anonymous

Most of it I know so I'll just post the ones i need help on.

41. SolomonZelman

Ok, 104÷13 =?

42. SolomonZelman

do that and then add the negative sign to the result

43. anonymous

-8?

44. SolomonZelman

Yes, that is right

45. anonymous

46. SolomonZelman

why 1/7 ?

47. SolomonZelman

remember that I said (-a)•(-b) is same as just a•b? Same applies to division: That is, (-a)÷(-b)=a÷b so what is 84÷12 ?

48. anonymous

7.

49. SolomonZelman

yes, 7 is correct

50. anonymous

Are are really nice to take the time out and help :)

51. SolomonZelman

52. anonymous

I think its B, but just to check I posted.

53. SolomonZelman

yes, option B is correct (and the rest of the options are wrong).

54. anonymous

ok.

55. anonymous

Okay, problem here is i don't know what the two block things are

56. anonymous

those

57. SolomonZelman

Oh, these are absolute value bars

58. anonymous

oh...

59. SolomonZelman

Absolute value, one way to think of it: Say you have: "aboslute value of a" which is written as |a| |dw:1440473268072:dw|

60. SolomonZelman

so if you have |-a| then it will be also positive a.

61. SolomonZelman

for all a

62. anonymous

Ohhhh Now I get it. i NEVER knew what those were

63. SolomonZelman

But, absolute value is not relevant to the actual question tho'. Your balance after you spent 7\$ more than what you had is 7 dollars less, and that is represented by -7.

64. SolomonZelman

It is not just 7, or not |7| or |-7|, because spending more than what you have is a negative 7 dollars on your account.

65. anonymous

Okay bare with me here.. I absolutly SUCK at box and whiskers

66. anonymous

I chose C btw

67. SolomonZelman

Oh, it is 11:33 pm in my location. I am very late, I am sorry-:( I wasn't looking at the time this whole time, I really have to go, but you can tag other people to help, or open a new post.

68. SolomonZelman

@YellowFlowers__ this is how you tag

69. SolomonZelman

I apologize and wish you good luck