Homework Help: Calculus

Posted by Kelly on Sunday, December 9, 2007 at 12:44pm.

Write a formuls for the general term(nth term) of the arithmetic sequence. Do not use a recursion formula. Then use the formula for A to the n to find the indicated term of the sequence

find a11: 12, 10, 8,...

Calculus - Damon, Sunday, December 9, 2007 at 3:16pm
The first term is a1
Every subsequent term is a constant number d greater than the one before so it goes:
a1
a2 = a1 + d
a3 = a1 + 2d
a4 = a1 + 3d
a5 = a1 + 4d
.....
an = a1 + (n-1)d

for example
a14 = a1 + 13*d
- Calculus - Kelly, Sunday, December 9, 2007 at 7:05pm
  makes no sense thats how i was doing it and I came up with 3.5
  
  a11 = 12 + 10(.8444) = 3.5
  
  however the answers to choose from are
  
  .32
  -8
  -10
  .34

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