Question 1158555


evaluate {{{a(b(n)) }}}for {{{a(b)=3b}}} and {{{b(n)=5n-9}}} when {{{n=3}}}

{{{a(b(n)) =a(5n-9)}}}

{{{a(b(n)) =3(5n-9)}}}

{{{a(b(n)) =15n-27}}}