Rewrite the expression in the form x^n

How do you use the additive inverse to evaluate an expression that uses subtraction in a full sentence

To describe a sequence of transformations that maps triangle abc onto triangle a"b"c", a student starts with a reflection over the x-axis.how should the student complete the sequence of transformations to map triangle abc onto triangle a"b"c"? plz

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?