Examine the following 21-day credit calendar. The opening balance is Y dollars. On March 23, a purchase of X dollars was made. On March 28, a payment of Z dollars was made. On April 4, a purchase of W dollars was made.

a. What is the algebraic expression for the daily balance on March 23? Write it in on that date and on March 24-27.
b. What is the algebraic expression for the daily balance on March 28 after the payment is made? Write it in on that date and on March 29 to April 3.
c. What is the algebraic expression that represents the daily balance on April 4 after the purchase is made? Write it in on that date and on April 5.
d. Write the algebraic expression for the sum of the daily balances.
e. What is the algebraic expression for the average daily balance?

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MARCH 19 APRIL 13 14