Sole w - 12 = -3 using mental math

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

An object in geometry with no width, length or height is a(n):

Ineed to find the answer to number 2