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13.3

its easy bc its basic order of operations

Yeah I know NVM :) thanks

can i hav a medal o.O

tyvm

np

for this:\[\frac{8- 6.2}{5 + 7(0.91)}\]
you need to follow BODMAS - have you heard about that?

it is known by other names as well, see here: http://en.wikipedia.org/wiki/Order_of_operations

Ok let me check it out hold on

look at the 2nd section "The standard order of operations"

Ok hold on hmm SO MANY WORDS!! D:

lol typical wikipedia

Ok I kinda got it

(not really so much)

kwl i hope u pass :)

good - so first thing to attack is the brackets

Thanks

Ok

^^...

ok

:p

Mhm ok

hmmm
ok im confused...

lets jus concentrate on the denominator for now, we had:\[5+7(0.91)\]correct?

yes

now note that a(b) simply means a*b - agreed?

ok

agreed

so we can say that:\[5+7(0.91)=5+7*0.91\]

does that make sense now?

ok got tht

yes

good - now what should the next set of operations be?

we have handled the brackets

um to multiply?>

sorry didnt mean to put >

Yea!! Ok

so what is 7 * 0.91 = ?

Um hold on

6.37

wouldnt you add? or subtract?

add?

ok

hang on a second - I think I misread your question

I believe it was this instead:\[8- 6.2 \div 5 + 7(0.91)\]

am I right?

yes

wait

yes

ok, sorry I originally interpreted it as:\((8- 6.2) \div (5 + 7(0.91))\)

ohhh ok

so lets start again - ok?

ok

thats how far we got

so next we should do what?

add?

or no subtract

nope - have a closer look at what is still left

like left to right but switch add with division

it should be division next

so divide?

ok

so what is 6.2 divided by 5 = ?

ok hold on

(a quick trick to divide by 5 is to divide by 10 and then halve the result)

|dw:1347581921786:dw|

sorry i was drawing :P

that is not correct

o.o

ok :) so now how do i do it ? :|

the /quick/ method or using long division like you attempted up there?

or like were did i mess up

um i guess....

go on

|dw:1347582167712:dw|

oh

i get it!!!

my decimal messed me up..

Hmmm ok

ok, so we now have:\[8- 6.2 \div 5 + 6.37=8-1.24+6.37\]

the rest should now be straight forward

so adding?

sure

ok

but be careful with the signs

I got this part let me draw it for you

|dw:1347582462471:dw|

remember the 1.24 has a minus sign next to it

so this is really "-1.24 + 6.37"

no thats not a negative its a minus

so it might be better to first do "8 - 1.24"

ok

6.76?

then add

think of it in this way:\[8- 6.2 \div 5 + 6.37=8-1.24+6.37=8+(-1.24)+6.37\]

yes add next

ok so 13.13

I was trying to explain why you had to do "-1.24 + 6.37" previously

Yaaa i got it my text book says that but i needed to work it out thank you!!!!!

yes - that is the correct answer

ok

yw :)

Thanks once again!! :D

np :)