Question

In an arithmetic sequence 10th term is 20 and 20th term is 10.what is the common difference? write the first term? what is the algebraic expression for this sequence?​

Answer 1

bŗāįŋlįęşţ mę.

Step-by-step explanation:

t10= 20

a+9d = 20

t20= 10

a+ 19d= 30

10d= 10

d= 1

a=11

now a+29d= 11+29= 40