Sean says that to add a number to -100 and still have-100 is to add. Zero. Candace says that she xan add two numbers to -100 and still have -100. Who is correct and why?

Eiko is wearing a magic ring that increases the power of her healing spell by 30%. without the ring, her healing spell restores h health points. which of the following expressions could represent how many health points the spell restores when eiko is wearing the magic ring?