# Precalculus

posted by Y

Find each of the sums indicated or described. Show use of the appropriate formula, rather than simply using a calculator to add them.

1) The sum of the first 17 terms of a geometric series with a first term of 3000 and a common ratio of 1/2.

2) 7+9+11+13+... 10 terms

3) 1 + ã2 + 2 + 2ã2... 12 terms

1. Y

The "ã" are suppose to be square root symbols.

2. Steve

#1: S = 3000(1-1/2^17)/(1 - 1/2)
#2: S = 10/2 (2*7+2)
#3: S = 1(√2^12 - 1)/(√2-1)

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