Not sure why the bother with saying u=g. Might as well just stay with u. Anyway,
u = x+18
y = f(u) = 1/√u = 1/√(x+18)
Complete the table.
y = f(g(x)) u = g(x) y = f(u)
y = (x + 18)^(-1/2) u = ? y=?
Use the chain rule.
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