The sides of a square are 3 cm long. One vertex of the square is at (3, 0) on a coordinate grid. Which of the following points could also be a vertex of the square?

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?