Geometry test, you only have to put the correct letter don’t worry about typing out the whole answer

Given this information, which expression must represent the value of b?

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

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