A piece for a board game is shaped like a triangular prism. The piece is 18 mm long. The base is an equilateral triangle with 10 mm sides and a height of 9 mm. Find the surface area of the game piece

Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups