Respuesta :

Answer:

39

Step-by-step explanation:

A(n) = 15 + 3(n-1)

A(9) = 15 + 3 *(9 - 1)

       = 15 + 3 * 8

        = 15 + 24

        = 39

A(n)=15+3(n-1)
if the (n) is 9 then:
A(9)=15+3(9-1)
A(9)=15+3*8
A(9)=15+24
A(9)=39
Hope it helped :)