Question

 a=5, d=2 find t9


cgvub​

Answer 1

$a = 5 \\ \\ d = 2$

t₉ = ?

We know, tₙ = a + (n-1)d

=≻ t₉ = 5 + (9-1)×2

= 5 + 8 ×2

= 5+16

= 21 Answer.