A13-foot ladder is placed against a vertical wall of a building, with the bottom of the ladder standing on level ground 7 feet from the base of the building. how high up the wall does the ladder reach?

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?