SOLUTION: Identify the formula for sequences given below. 1. {11,7,3,-1,-5...} 2.{76.8,96,120,150...}

Algebra ->  Sequences-and-series -> SOLUTION: Identify the formula for sequences given below. 1. {11,7,3,-1,-5...} 2.{76.8,96,120,150...}       Log On


   

Question 1179196: Identify the formula for sequences given below.
1. {11,7,3,-1,-5...}
2.{76.8,96,120,150...}
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

1. {11,7,3,-1,-5...}
We see that the common difference of the sequence is -4,

your formula is:
a%5Bn%5D=11-4%28n-1%29

2. 2.{76.8,96,120,150...}
96%2F76.8=5%2F4
120%2F96=5%2F4=> r=5%2F4

since a%5B1%5D=76.8 and r=5%2F4, nth term formula
a%5Bn%5D=76.8%2A%285%2F4%29%5E%28n-1%29