Find The 9th Term Of The Arithmetic Sequence With A1=10 And D= - 1/2.

Find the 9th term of the arithmetic sequence with a1=10 and d= - 1/2.

 

ANSWER :

The 9th term is 6.

STEP BY STEP EXPLANATION :

An = A1 + (n - 1) × R

A9 = 10 + (9 - 1) × (-1/2)

A9 = 10 + 8 × (-1/2)

A9 = 10 + (-8/2)

A9 = 10 + (-4)

A9 = 10 - 4

A9 = 6

Therefore , the 9th term is 6.

OK.