Question

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Answer 1

pretty sure you have to use the partial sums formula for 8

Answer 2

do u know formulae for sum of finite and infinite terms in a geometric sequence??

Answer 3

@coolaidd

Answer 4

It's a geometric series a + ar + ar^2 + ... with a=1 and r = 3/2. Plug into the formula

Answer 5

http://en.wikipedia.org/wiki/Geometric_progression
if u have finite geometric progession the sum is a1(q^n-1)/(q-1)
if u have infinite geometric progresion the formula is a1/(1-r) where where a1 is the first therm r is the common ratio (u multyply all therms in progresion )