Alg2H 11-5 Series using Sigma Notation Lesson/HW Worksheet #7a Date _____WK #7a 1) Write in Sigma Notation. 2) Then evaluate each sum using the appropriate Sum formula

1. 5 + 8 + 11 + ……+ 65

2. 31250

1.....

50

1

10

1

2

1

3. 4 + 5 + 6 + 7 + ….. + 23

4. For the geometric series t3 = 1, t5 = 9

4. Write S10 using sigma notation and evaluate the sum.

(Remember: In this problem there are 2 sets of answers because there are 2 possible values for r )

5. In the geometric series t7 = 4 and t11 = .0004.

a) Find r, allowing r to be complex b) Find t8, t9, t10 for each value of r

c) For the positive real value of r , Sn = 4,444,444. Find n