Final answer:
The question involves identifying expressions not equivalent to -4m + 28. Expressions that do not simplify to -4m + 28 after algebraic manipulation are not equivalent. An example is -4m + 60, which is obtained by adding 32 to the original expression.
Step-by-step explanation:
The question pertains to identifying expressions that are not equivalent to the given expression, -4m + 28. To determine if an expression is equivalent, one could perform algebraic manipulations or use specific properties of equality. However, the information provided from LibreTexts and pertaining to quadratic equations - with constants a = 4.90, b = 14.3, and c = -20.0 - does not directly help us find non-equivalent expressions to -4m + 28 as it refers to a different form of equation. Nonetheless, any expression that does not simplify to -4m + 28 after applying algebraic rules is not equivalent. For example, simplifying -4m + 28 + 32 results in an expression (-4m + 60) that is not equivalent to -4m + 28 because adding or subtracting a number changes the value of an expression according to LibreTexts.