Further maths
posted by Zainab .
The 8th term of a linear sequence is 18th and the 12th term is 26th .find the first term,common difference and the 20th term

Further maths 
Reiny
Your question does not make sense
"The 8th term of a linear sequence is 18th"
= gobbledegoop!
In any arithmetic (linear) sequence, the terms either increase or decrease. A term can never repeat itself
if you meant:
The 8th term of a linear sequence is 18 , we can do something
Correct your question, and we'll go from there. 
Further maths 
Reiny
a+7d = 18
a+11d = 26
subtract them:
4d = 8
d = 2
in a+7d = 18
2+7d = 18
carry on
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