Answers

2014-10-03T17:02:03+08:00
N = -8 -2[2-(6-1)-7]


-8 -2[2-(5)-7]  --- Solve the inner parenthesis first. 6-1=5

-8 -2[2-5-7] --- Multiply the negative to 5.

-8 -2(-10) --- Solve the parenthesis 2-5-7 = -10

-8 + 20 --- Multiply -2 to -10

N = 12 --- Solve, 20-8


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2014-10-04T10:30:34+08:00
-8 -[2-(6-1)-7] = N
To answer this, first you must give your attention to the inner parenthesis (6-1)=5
-8-[2-5-7] = N     In this case 5 is negative because we removed the parentesis.
-8-[-10]=N
-8+10=N    since 10 is negative, removing the bracket will make it positive because negative times negative is positive.
So you will have
2=N
N=2
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