Is - (-0.5x + 10) equivalent to 1/2x + 10?

no

Step-by-step explanation:

if you have a subtraction sign outside parenthesis, such as - (-0.5x + 10), then the - goes to all numbers inside it:

- (-0.5x + 10) would be

0.5x - 10 after distributing the negative sign

so that is incorrect because 0.5x - 10 is not equivalent to 1/2x + 10