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Let i = items delivered

3/18 i delivered late   3/18(-5)i = fee for late parcels

15/18 i Delivered on time  15/18 (9)i = moner earned for on time parcels 

Then     3/18(-5)i + 15/18 (9) i = 12000    solve for i

-15/18i + 135/18 i = 12000

120i/18 =12000

120i = 12000(18)

i = 12000(18)/120 =100(18)=1800 number of items delivered

~jc

Oh...Well.. I have NOT taken Chemestry yet, And im a junior, uh- oh! I don't think it's a requirment, though.

A mole is the gram molecular weight. You can find it on the periodic table of the elements. The kind of chemistry is the easy part to understand.   

IF   l = isqrt3    it has a solution   i=sqrt (-1)   so l x l = -3   would be

sqrt(-1)sqrt(3) x sqrt(-1)sqrt(3) = sqrt(-1)sqrt(-1) x sqrt 3 sqrt 3 = (-1)(3) = -3

Maybe you have not covered imaginary numbers like 'i' = (sqrt(-1) just yet.....

~jc

You're welcome, Great way to start a Monday :)

Thanks..!!!

Oh My Goodness.. This is a lot to do! Hmmm....

Oh, Well.. Ima give you some more (:

Thanks lol I need them I have like 3 I did have 15 but there gone 

I'm Giving you stars, Brii (:

How much potassium is in WHAT compound??   KCl for example is a salt  made up of  K (potassium - atomic weight 39.0983) and Cl (Chlorine - Atomic weight 35.45)  so the fraction of K in any given sample would be   39.0983/(39.0983 + 35.45)  = .524469  Potassium( K)

Do you know what compound we are concerned about how much K it contains?  

~jc

Brii! Hey Girlyy (:

Yay! No school for you!

See? I told you I'd be on today (:

Hey ... I just woke up .. I'm not in school because of snow 

BTW: I'm giving you stars, Victoria ;)

This is all very confusing to me!

Oh nothing, working on a Project, you?

The number at the bottom of the cell in the table of periodic elements is the the number of grams of that substance that is a 'mole' of that substance   ,  a mole has 6.023 x 10^23 atoms of that substance.

Nevermind, I just put that so if he sees this post he can be reminded that he forgot to return it.

What r u doing Hayley?

LOL! What did he do?

With my luck, nope... I blame it on Rarin taking it all...:)

Thanks Alan

I know right! I was like " No, I missed him!!" Ugh!! MAybe, We'll catch him ! :(

IKR, I hope it snows... Not gonna happen:(

What?!?!? Jc was on!? I didn't see him! But I left the forum around midnight, so I might've easily missed him:( good morning to u too Hayley!

Hey, Victoria (:

Yes, Cold has Finally come ! :)