Mathematics
OpenStudy (anonymous):

4-8+16-32..., n=7 evaluate the geometric series

Well, first find the common ratio, which is 2. Your first term is 4 so your equation is ${(-1)^{n-1}}4 (2)^{n-1}$

OpenStudy (anonymous):

$8^{3}$ or 512

nope, exponential always comes first so $4 \times 2^6$

OpenStudy (anonymous):

so256

should be just check by plugging in the values for n: n=1 should be 4, n=2 should be -8, n=3 should be 16 etc

oh, and because the -1 and 2 both have exponents of n-1, you can combine them

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