Algebra 2 Help?! Geometric series?

Find S subbase 10 for a series.

first term is 5 and common ratio 2

A. 2555

B. 55

C. 5115

D. 511

Comments

  • S_n = a(r^n - 1)/(r - 1)

    S_10 = 5(2^10 - 1)

    = 5(1024 - 1)

    = 5115

  • in case you seem on the sum of the 1st few units of words: 2 2+a million=3 2+a million+a million/2 = 3 a million/2 2+a million+a million/2+a million/4 = 3 3/4 3 7/8 3 15/sixteen Will proceed like this yet will by no skill quite attain 4, yet once you strengthen it to infinity, the it could tend to 4.

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