Mathematics
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OpenStudy (anonymous):
I Will Medal And Fan! I need explanation AND answer!
Evaluate the following.
12 divided 4 + 9 - 3 x 4
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OpenStudy (phi):
have you learned order of operations?
OpenStudy (anonymous):
yes
OpenStudy (idku):
\(12\div 4+9-3\times 4\)
like this? (just wanna verify)
OpenStudy (anonymous):
yes
OpenStudy (phi):
you should remember divide first before add or subtract
start on the left side and do 12 divided by 4 first. what do you get ?
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OpenStudy (anonymous):
3
OpenStudy (phi):
yes, so replace \(12 \div 4\) with 3
what do you have now?
OpenStudy (anonymous):
3 + 9 - 3 x 4
OpenStudy (phi):
ok, now look for any multiply (or divide)
if you find one, do it.
OpenStudy (anonymous):
3 x 4 = 12
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OpenStudy (phi):
ok, so replace 3*4 with 12
what do we have now?
OpenStudy (anonymous):
3 + 9 - 3 and idk what to do with the 12
OpenStudy (phi):
you had
3+9 - 3*4
you do the multiply
OpenStudy (anonymous):
i did. its 12
OpenStudy (phi):
yes, and how do write the new expression (it has to have a 12 in it)
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OpenStudy (anonymous):
idk then
OpenStudy (phi):
3+9 - 3*4
replace 3*4 with 12 (they mean the same thing)
OpenStudy (anonymous):
3 + 9 - 12
OpenStudy (phi):
ok, now with just add subtract, work left to right
first do 3+9
OpenStudy (anonymous):
the answer would be 0
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OpenStudy (phi):
yes
OpenStudy (anonymous):
3 + 9 = 12, 12 - 12 = 0
OpenStudy (anonymous):
i've got a feeling this is somehow wrong but oh well
OpenStudy (anonymous):
its never been 0
OpenStudy (phi):
if this is the question
\[ 12\div 4+9-3\times 4 \]
then 0 is the answer
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OpenStudy (phi):
in math, if you follow the rules carefully, you get the answer.
OpenStudy (anonymous):
Let's simplify step-by-step.
12
4
+9−3x(4)
=3+9+−12x
Combine Like Terms:
=3+9+−12x
=(−12x)+(3+9)
=−12x+12
Answer:
=−12x+12