Evaluate the following sums. show your work!
a. σ[infinity] i=0 1/4^i
b. σ[infinity] i=0 i/4^i
c. σ[infinity] i=0 i^2/4^i

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step-by-step explanation:

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

idk

step-by-step explanation:

for future students the answer is b

hope i

-lavira: )