anonymous
  • anonymous
8- 6.2 divided by 5 + 7(0.91) help me please
Mathematics
  • Stacey Warren - Expert brainly.com
Hey! We 've verified this expert answer for you, click below to unlock the details :)
SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
13.3
anonymous
  • anonymous
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...
anonymous
  • anonymous
its easy bc its basic order of operations

Looking for something else?

Not the answer you are looking for? Search for more explanations.

More answers

anonymous
  • anonymous
Yeah I know NVM :) thanks
anonymous
  • anonymous
can i hav a medal o.O
anonymous
  • anonymous
tyvm
anonymous
  • anonymous
np
asnaseer
  • asnaseer
for this:\[\frac{8- 6.2}{5 + 7(0.91)}\] you need to follow BODMAS - have you heard about that?
asnaseer
  • asnaseer
it is known by other names as well, see here: http://en.wikipedia.org/wiki/Order_of_operations
anonymous
  • anonymous
Ok let me check it out hold on
asnaseer
  • asnaseer
look at the 2nd section "The standard order of operations"
anonymous
  • anonymous
Ok hold on hmm SO MANY WORDS!! D:
anonymous
  • anonymous
lol typical wikipedia
anonymous
  • anonymous
Ok I kinda got it
anonymous
  • anonymous
(not really so much)
anonymous
  • anonymous
kwl i hope u pass :)
asnaseer
  • asnaseer
good - so first thing to attack is the brackets
anonymous
  • anonymous
Thanks
anonymous
  • anonymous
Ok
anonymous
  • anonymous
^^...
asnaseer
  • asnaseer
in this case the brackets just contain a number - so no actual operation to perform inside the brackets
anonymous
  • anonymous
ok
asnaseer
  • asnaseer
we can therefore remove the brackets to end up with:\[\frac{8- 6.2}{5 + 7(0.91)}=\frac{8- 6.2}{5 + 7*0.91}\]
anonymous
  • anonymous
:p
anonymous
  • anonymous
Mhm ok
anonymous
  • anonymous
hmmm ok im confused...
asnaseer
  • asnaseer
lets jus concentrate on the denominator for now, we had:\[5+7(0.91)\]correct?
anonymous
  • anonymous
yes
asnaseer
  • asnaseer
now note that a(b) simply means a*b - agreed?
anonymous
  • anonymous
ok
anonymous
  • anonymous
agreed
asnaseer
  • asnaseer
so we can say that:\[5+7(0.91)=5+7*0.91\]
asnaseer
  • asnaseer
does that make sense now?
anonymous
  • anonymous
ok got tht
anonymous
  • anonymous
yes
asnaseer
  • asnaseer
good - now what should the next set of operations be?
asnaseer
  • asnaseer
we have handled the brackets
anonymous
  • anonymous
um to multiply?>
anonymous
  • anonymous
sorry didnt mean to put >
asnaseer
  • asnaseer
it should be exponents and roots next - but you do not have any here so we go to the next one: multiplication an division
anonymous
  • anonymous
Yea!! Ok
asnaseer
  • asnaseer
so what is 7 * 0.91 = ?
anonymous
  • anonymous
Um hold on
anonymous
  • anonymous
6.37
asnaseer
  • asnaseer
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
anonymous
  • anonymous
wouldnt you add? or subtract?
anonymous
  • anonymous
add?
asnaseer
  • asnaseer
but what you need to remember is that you go through BODMAS for the numerator and the denominator seperately
anonymous
  • anonymous
ok
asnaseer
  • asnaseer
hang on a second - I think I misread your question
asnaseer
  • asnaseer
I believe it was this instead:\[8- 6.2 \div 5 + 7(0.91)\]
asnaseer
  • asnaseer
am I right?
anonymous
  • anonymous
yes
anonymous
  • anonymous
wait
anonymous
  • anonymous
yes
asnaseer
  • asnaseer
ok, sorry I originally interpreted it as:\((8- 6.2) \div (5 + 7(0.91))\)
anonymous
  • anonymous
ohhh ok
asnaseer
  • asnaseer
so lets start again - ok?
anonymous
  • anonymous
ok
asnaseer
  • asnaseer
\[8- 6.2 \div 5 + 7(0.91)\]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\[8- 6.2 \div 5 + 6.37\]
asnaseer
  • asnaseer
thats how far we got
asnaseer
  • asnaseer
so next we should do what?
anonymous
  • anonymous
add?
anonymous
  • anonymous
or no subtract
asnaseer
  • asnaseer
nope - have a closer look at what is still left
anonymous
  • anonymous
like left to right but switch add with division
asnaseer
  • asnaseer
it should be division next
anonymous
  • anonymous
so divide?
anonymous
  • anonymous
ok
asnaseer
  • asnaseer
so what is 6.2 divided by 5 = ?
anonymous
  • anonymous
ok hold on
asnaseer
  • asnaseer
(a quick trick to divide by 5 is to divide by 10 and then halve the result)
anonymous
  • anonymous
|dw:1347581921786:dw|
anonymous
  • anonymous
sorry i was drawing :P
asnaseer
  • asnaseer
that is not correct
anonymous
  • anonymous
o.o
anonymous
  • anonymous
ok :) so now how do i do it ? :|
asnaseer
  • asnaseer
the /quick/ method or using long division like you attempted up there?
anonymous
  • anonymous
or like were did i mess up
anonymous
  • anonymous
um i guess....
anonymous
  • anonymous
go on
asnaseer
  • asnaseer
|dw:1347582167712:dw|
anonymous
  • anonymous
oh
anonymous
  • anonymous
i get it!!!
anonymous
  • anonymous
my decimal messed me up..
asnaseer
  • asnaseer
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)
anonymous
  • anonymous
Hmmm ok
asnaseer
  • asnaseer
ok, so we now have:\[8- 6.2 \div 5 + 6.37=8-1.24+6.37\]
asnaseer
  • asnaseer
the rest should now be straight forward
anonymous
  • anonymous
so adding?
asnaseer
  • asnaseer
sure
anonymous
  • anonymous
ok
asnaseer
  • asnaseer
but be careful with the signs
anonymous
  • anonymous
I got this part let me draw it for you
anonymous
  • anonymous
|dw:1347582462471:dw|
asnaseer
  • asnaseer
remember the 1.24 has a minus sign next to it
asnaseer
  • asnaseer
so this is really "-1.24 + 6.37"
anonymous
  • anonymous
no thats not a negative its a minus
asnaseer
  • asnaseer
so it might be better to first do "8 - 1.24"
anonymous
  • anonymous
ok
anonymous
  • anonymous
6.76?
anonymous
  • anonymous
then add
asnaseer
  • asnaseer
think of it in this way:\[8- 6.2 \div 5 + 6.37=8-1.24+6.37=8+(-1.24)+6.37\]
asnaseer
  • asnaseer
yes add next
anonymous
  • anonymous
ok so 13.13
asnaseer
  • asnaseer
I was trying to explain why you had to do "-1.24 + 6.37" previously
anonymous
  • anonymous
Yaaa i got it my text book says that but i needed to work it out thank you!!!!!
asnaseer
  • asnaseer
yes - that is the correct answer
anonymous
  • anonymous
ok
asnaseer
  • asnaseer
yw :)
anonymous
  • anonymous
Thanks once again!! :D
asnaseer
  • asnaseer
np :)

Looking for something else?

Not the answer you are looking for? Search for more explanations.