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The correct answer is 8

i got 8 !! :D now wait a sec i'll check ur work

http://prntscr.com/8ig2duis it 45/n ??

The screenshot didn't work

But in the beginning I did get 45/n

okay so at left side is it 45/n it's a 2nd row

how did you get that ?

Oooh...I combined 1/2 n and 90. not like terms so I cant do that right?

it's \[\frac{ 3 }{ 2}n = \frac{3n}{2}\] n isn't at the denominator

ye first combine 12-3/2

Ok. I will try again quickly.

okay :=)

I got 7.46, Did I lose some accuracy somewhere or is that what I am meant to get?

yes that's not correct

Awwww. Oh well. Ok should i post my working out again?

yes

a + 4d - a = 4d = 12 - 6 = 6
so d = 3/2

the n=9 is from the other equation

Oh. I think I forgot that its over 2

no you didn't
you distributed the parentheses by (1/2)n

Yes?

I'm sorry, I don't really understand whaI did wrong?

i know what happened t o12.25 ?? check ur 6th and 7th row

I was making a perfect square

w|dw:1442760681511:dw|
you should add (b/2)^2 to both sides

it's n^2 ** typo

Oh!! I forget to do that a lot >:/ Ok, third time lucky. Trying again.

Aaaaand I am finally getting it right!

Yahooo!!

Thank you for your patience and for helping me so much! :D

my pleasure &GREAT JOB!!
i like how u posted ur work :=) that was super cool!

good luck!!

Thanks!

o^_^o