Consider the calculation of x-y+(-z) where x and z are positive real numbers an y is a negative real number. Which directions of motion for this calculation?
Is the final answer positive or negative, or undetermined?

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