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anonymous
 one year ago
Find the sum of a finite geometric sequence from n = 1 to n = 6, using the expression 2(5)n  1.
1,223
1,023
7,812
7,812
anonymous
 one year ago
Find the sum of a finite geometric sequence from n = 1 to n = 6, using the expression 2(5)n  1. 1,223 1,023 7,812 7,812

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welshfella
 one year ago
Best ResponseYou've already chosen the best response.1Sn = a1 * r^n  1  r  1

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1here a1 = 2 , r = 5, n = 6

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Sn = 2 * 5^6  1 = 15624   = 7812.5 5  1 4

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Can you help me with this one: Find the sum of a finite arithmetic sequence from n = 1 to n = 15, using the expression 2n + 5.

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1i'm assuming 2n + 5 is the formula for the nth term so first term would be 2+ 5 = 7 and 15th term would be 2(15) + 5 = 35 Sn = (n/2) ( a + l) here n = number of terms, a = first term and l = last ( 15th) term

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I dont understand what to do
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