(8 pts) 6. A total of $4500 is invested in a money market account and a savings account. The money market account yields interest at the annual rate of 6%, and the savings account yields interest at the annual rate of 4%. The total interest after one year was $250. Determine how much was invested in each account. (6 pts) 7. An arithmetic sequence has first term a = 10 and common difference d = 3. (a) Find a formula for the general term a,, (b) Determine the term a60 . (c) Find the sum of the first 50 terms. 63