Plz help will give . flvs question

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

Use sigma notation to represent the following series for 9 terms.

What is the sum of these mixed numbers 4 2/3+ 3 1/9