Given data:
The firs term of AP is a=14.
The second term of AP is b=23.
The expression for the common difference is,
d=b-a
Substitute the given values.
d=23-14
=9
The expression for the 80th term is,
[tex]a_{80}=a+79d[/tex]substitute 14 for a, and 9 for d in the above expression.
[tex]\begin{gathered} a_{80}=14+79(9) \\ =725 \end{gathered}[/tex]Thus, the 80th term of AP is 725.
