TRY IT:

Find

a52
 

a717


Here's our official formula:

Given an arithmetic sequence

a1 , a2 , a3 , ... , an , ...

that has a difference of d,

the nth term is

an = a1 + ( n - 1 ) * d

 


YOUR TURN:

Given the arithmetic sequence

5 , ( 9 / 2 ) , 4 , ( 7 / 2 ) , 3 , ...

Find 05-sequences-and-series-35.gif.

Find the formula for the nth term.

Find a39 .
     
Find a100 .