Question

The sum of first and 21st term of an arithmetic sequence is 140
a) what is the 11th term ?
b) write the sequence if the first term is 10?

Answer 1

Step-by-step explanation:

1) a+a+20d=140

2a+20d=140

2(a+10d)=140

a+10d=70

so 11th term is 70

2)

a=10

so a+10d=70

10d=70-10=60

d=60/10=6

so the A. p will be

10, 16, 22, 28....