Question

find the number of terms in the following arithmetic sequence
72, 63, 54,....0​

Answer 1

Answer:

9

Step-by-step explanation:

a= 72 ,d = (-9)

Now,

An = a+ (n-1)d

0= 72+(n-1)(-9)

0=72-9n +9

-9n = -81

n = 81/9

n= 9

I hope my explanation will help you

Answer 2

Answer:

an = a+(n-1)d

0 = 72 +(n-1)9

0= 72+9n-9

0=63+9n

63=9n

n=63/9

n=7