Question

find the 21 term of ap -9/2, -3, -3/2,...

Answer 1

Answer:

n=21

t1=a= -9/2

t2= -3

t3= -3/2

d=t2-t1= -3-(-9/2)

=3/2

Step-by-step explanation:

Now,

By using formula

tn = a +(n-1)d

t21 =-9/2 + (21-1)3/2

=69/2

Hope it helps...