book Maths Puzzle Numerical Ability

If h(x) = (x + 4) / (3x - 7) what is (h o h)(x) in its simplest form?

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book Other Question

the question is:
graph the info by drawing tf in the y axis and tc in the x axis and plot the information on freezing and boiling temps as points on the graph.
and it gives us a
X+4/6=X-3/5