Warm Up
1. Find the sum for the first six terms of this geometric sequence.
6, 15, 37.5, .......
2. Find the sum of this arithmetic sequence.
5, 11, ........ 53
1
2
3
4
In an arithmetic sequence, a84 = 344.7 and a23 = 88.5 , find a15.
5
In a geometric sequence, a9 = 3075.46875 and a4 = 405 , find a1.
6
In a geometric sequence, a3 = ­800/3 and a10 = 102400/6561
1. Find a4
2. Find sum of a0 through a9. 7
19
­4i + 3
i = 2
1. Write out the first several terms in expanded form.
2. Find the sum using sum formulas.
8
8
.5(­2)i
i = 1
1. Write out the first several terms in expanded form.
2. Find the sum using sum formulas.
9