Posted by **Jade** on Wednesday, June 18, 2014 at 8:59pm.

1. What is the tenth term of the geometric sequence whose first term (a1) is 16 and the common ratio (r) is –½?

2. Given the terms a10 = 3 / 512 and

a15 = 3 / 16384 of a geometric sequence, find the exact value of the first term of the sequence.

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