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8- 6.2 divided by 5 + 7(0.91) help me please

Mathematics
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13.3
My textbook says 13.13 so I was wondering how they got that. Can you show me/ Tell me how you got that answer because I'm kinda confused...
its easy bc its basic order of operations

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Other answers:

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
^^...
in this case the brackets just contain a number - so no actual operation to perform inside the brackets
ok
we can therefore remove the brackets to end up with:\[\frac{8- 6.2}{5 + 7(0.91)}=\frac{8- 6.2}{5 + 7*0.91}\]
: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 >
it should be exponents and roots next - but you do not have any here so we go to the next one: multiplication an division
Yea!! Ok
so what is 7 * 0.91 = ?
Um hold on
6.37
correct, so now we end up with:\[\frac{8- 6.2}{5 + 7(0.91)}=\frac{8- 6.2}{5 + 7*0.91}=\frac{8- 6.2}{5 + 6.37}\]now most people get confused here because they think the next thing to do is the division
wouldnt you add? or subtract?
add?
but what you need to remember is that you go through BODMAS for the numerator and the denominator seperately
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
\[8- 6.2 \div 5 + 7(0.91)\]first step - brackets to get:\[8- 6.2 \div 5 + 7(0.91)=8- 6.2 \div 5 + 7*0.91\]next is exponents/root but we have none next is multiplication/division - we have both, so you did 7*0.91 = 6.37\[8- 6.2 \div 5 + 6.37\]
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..
the other way is 6.2 divided by 10 is 0.62 double that is 0.62 + 0.62 = 1.24 (sorry I incorrectly stated you halve the result up there - it should be double the result after dividing by 10)
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 :)

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