let number be x
36 - 2x = 72
- 2x = 36
x = - 18
2007-09-09 22:56:12
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answer #1
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answered by Como 7
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Let's say Bob's number is represented by the letter n. Twice Bob's number would be 2n. What you need to do now is set up an equation and solve for n.
36 - 2n = 72
Subtract 36 from both sides of the equation in order to isolate the 2n.
Now you have:
-2n=36
Divide both sides by negative 2n to get n all by itself.
n= -18.
You can always check your answer by plugging in the number you got for n into your orginal equation and making sure you get the result you were supposed to.
36 - 2(-18) =72
2007-09-06 22:55:35
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answer #2
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answered by Mud 2
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basically, it means
36-2x=72
where x is Bob's number
it's -2x because it says subtracted from 36 (the "from" means whatever came before is the thing being subtracted)
so, to solve...
36-2x=72
(add 2x to both sides)
36=72+2x
(subtract 72 from both sides)
-36=2x
(divide both sides by 2)
x=-18
Bob's number is -18
2007-09-06 22:55:45
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answer #3
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answered by Tryingtohelp 2
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2x - 36 =72
2x = 72 + 36
x = 108/2
x = 54
2007-09-06 22:58:13
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answer #4
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answered by Freesia 5
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I do not know if you know equations.
36-2X=72
-2X=72-36=36
X=-18
Bob's number is -18.
2007-09-06 22:54:28
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answer #5
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answered by Justyo ;) 2
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36 - 2 x Bn = 72
2 x Bn = - 36
Bn = -18
2007-09-06 22:53:46
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answer #6
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answered by Beardo 7
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first
36+72=108
108 divided by 2=44
his number was 44
plz make this a best answer
2007-09-06 22:53:19
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answer #7
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answered by Anonymous
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I can help set it up
if the number is n then the equation is
36 - 2n = 72
then solve for n
2007-09-06 22:52:57
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answer #8
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answered by ChemistryMom 5
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