exam Maths Puzzle Numerical Ability

Find the domain of the function.

h(x) = x-4/x3-64x

note: x3 is x to 3rd degree
and and it is a fraction
thanks

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exam Other Question

A cake has three circular tiers; each is 8 cm high. The tiers have diameters 60 cm, 48 cm, and 36 cm. What is the surface area to be covered by frosting? There is not frosting between layers. SOLVE FOR A
B= (7/8)* (A-12)