am l correct if so help

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[gentle hatch]

You found f(4) correctly. But if I'm understanding properly you're trying to find fg(18)? And then you just got rid of f and only used g(x) which you can't do. fg(18) is a product, it's (f×g)(18) so, it'd be better if you defined the function (f×g)(x) first, which is simply f(x)×g(x) and then substitute 18 in the new function you get.

[hollow jackal]

No your wrong

The answer l found was correct so fg(18) is equivalent to 1.5

[gentle hatch]

But you found f(4) to be 1.5 and then found fg(18) to be 4