Answer
C
Work Step by Step
Before finding the solution to all 4 equations, look at the equations to see if any appear to be unreasonable and determine whether that equation is false.
Choice C seems to be unreasonable because you are adding two numbers that are greater than 50, but the given result is negative. Simplify the expression to determine whether C is true or false.
$51-(-57)\overset?=-6\longrightarrow$ change subtraction to addition and reverse the sign
$51+57\overset?=-6\longrightarrow$ add
$108\ne-6\ \ X$
