Final answer:
To evaluate the expression -w + 8.5, substitute the given values for w and calculate the result.
Step-by-step explanation:
To evaluate the algebraic expression -w + 8.5, we substitute the given values of w into the expression.
For w = 12, the expression becomes: -12 + 8.5 = -3.5
For w = -1.5, the expression becomes: -(-1.5) + 8.5 = 10
For w = 5.3, the expression becomes: -5.3 + 8.5 = 3.2