- anonymous

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.

- schrodinger

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- anonymous

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- SolomonZelman

yes correct for #1

- SolomonZelman

trust me I am not guessing:O

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## More answers

- anonymous

Thanks, but can you show work pls.

- SolomonZelman

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

- anonymous

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- SolomonZelman

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

- anonymous

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

- anonymous

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- SolomonZelman

Yes that is right as well.

- SolomonZelman

(you already showed why)

- anonymous

ok, let me draw out the next one

- anonymous

Sorry took so long ...

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- SolomonZelman

negative Ã— negative = positive
(you are incorrect)

- 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)â€¢(-b)`, that will be the same as `aâ€¢b`.

- SolomonZelman

Now, lets perform the multiplication

- SolomonZelman

|dw:1440471613916:dw|

- SolomonZelman

Is everything clear, or you have any questions?

- 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

- SolomonZelman

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

- anonymous

Yeah.

- SolomonZelman

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

- anonymous

okay

- anonymous

Needed help...

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- SolomonZelman

\(\rm :\color{blue}{D}\)

- SolomonZelman

That symbol is division I suppose?

- SolomonZelman

Not square root...

- anonymous

k.

- SolomonZelman

\(\large\color{black}{ \displaystyle 6.9~\div~0.03 }\)

- 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, \(\large\color{black}{ \displaystyle \frac{A}{B}=\frac{A\times x}{B\times x} }\)

- SolomonZelman

do you agree?

- anonymous

Yes.

- SolomonZelman

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

- SolomonZelman

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

- anonymous

230

- SolomonZelman

Yup

- anonymous

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- SolomonZelman

your answer?

- anonymous

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

- anonymous

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

- SolomonZelman

Ok, 104Ã·13 =?

- SolomonZelman

do that and then add the negative sign to the result

- anonymous

-8?

- SolomonZelman

Yes, that is right

- anonymous

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- SolomonZelman

why 1/7 ?

- SolomonZelman

remember that I said (-a)â€¢(-b) is same as just aâ€¢b?
Same applies to division:
That is, (-a)Ã·(-b)=aÃ·b
so what is 84Ã·12 ?

- anonymous

7.

- SolomonZelman

yes, 7 is correct

- anonymous

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

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- SolomonZelman

please take a shot

- anonymous

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

- SolomonZelman

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

- anonymous

ok.

- anonymous

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

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- anonymous

those

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- SolomonZelman

Oh, these are absolute value bars

- anonymous

oh...

- SolomonZelman

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

- SolomonZelman

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

- SolomonZelman

for all a

- anonymous

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

- 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.

- 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.

- anonymous

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

- anonymous

I chose C btw

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- 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.

- SolomonZelman

@YellowFlowers__
this is how you tag

- SolomonZelman

I apologize and wish you good luck

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