SOLUTION: Fill in the parentheses to make each statement correct. See Example 4.

Question 299177: Fill in the parentheses to make each statement correct. See
Example 4.

Answer by wise1(2) (Show Source): You can put this solution on YOUR website!
-9 - (-2.3)= -9 +(?)
for this question, let's replace the question mark with x.
-9 - (-2.3)= -9 +(x)
next, we will open the brackets. remember, (-)*(-)=+
-9+2.3 = -9 + x
now we have to solve for x, this means we want x to be alone on one side of the = sign. if you move anything from one side of an = sign, it changes from - to+ or from + to -.
-9 +2.3 +9 =x
2.3=x , which is the same as
x=2.3
now all we have to do is replace the ? with 2.3
-9 - (-2.3)= -9 +(2.3)
and voila, we're all done
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