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Direction: Find the sum of an arithmetic sequence.

A. Find the indicated partial sum of each arithmetic series.

1) The first 9 terms of 5+8+11+\cdot\cdot\cdot

2) The first 30 terms of 1+3+5+\cdot\cdot\cdot

3) The first 14 terms of 6+9+12+\cdot\cdot\cdot

B. Solve for the value of n.

1) S_{n}=-80, a_{1}=10 , a_{n}=-26 n=

2) S_{n}=50 a_{1}=4 a_{n}=16 n= ?

C. Find Sn for each of the following given.

1. 6, 11, 16, 21, 26, 31, 36, 41, 46;

S9

2. 10, 15, 20, 25, ...;

S20

3. a1=25 d=4

S12

4. a_{1}=65 , a1o=101 ;

S10

5. a4=41 a_{12}=105

S8