Question

Determine the 25th term of an ap whose 9th term is -6 and common difference is5/4.

Answer 1

The 9th term of ap. = -6. d=-5/4. an=a +(n-1)d. a9=a+(9-1)×5/4 a9=a+10. -6=a+10. a=-6-10=-16. Now. a25=a+(24)d. a25=-16+24×5/4. a25 =-16+30=14. It is your answer I think it is helpful