If x and y are random variables with e(x) = 6 and e(y) = 9, then e(2x + 3y) is:
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:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

0if x and y vary inversely and y=6 as x=7, what is 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