For his long distance phone service, dale pays a $6 monthly fee plus 8 cents per minute. Last month, Dale's long distance bill was $21.28. For how many minutes was dale billed?

Proceed as in example 3 in section 6.1 to rewrite the given expression using a single power series whose general term involves xk. ∞ n(n − 1)cnxn − 2 n = 2 − 4 ∞ ncnxn n = 1 + ∞ cnxn n = 0

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

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