Answer:
138g
Step-by-step explanation:
38g+56g+44g=
138g
(a) Since
and
, we have

We're given that

but we can rewrite this as

(bear in mind that we can only do this so long as <em>x</em> ≠ 0) so it follows that

(b) On its own, we may be tempted to conclude that the domain of
is simply <em>x</em> ≠ -1. But we should be more careful. The domain of a composite depends on each of the component functions involved.
is defined for all <em>x</em> - no issue here.
is defined for all <em>x</em> ≠ 0. Then
also has a domain of <em>x</em> ≠ 0.
is defined for all <em>x</em> ≠ -1, but

is undefined not only at <em>x</em> = -1, but also at <em>x</em> = 0. So the domain of
is

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4.625 = 4 625 / 1000 = 4 5/8