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Step-by-step explanation:
5) (i) By using formula the volume of a pyramid having a base area A and vertical height h is 1/3Ah.
V= 1/12 h³
(ii) dV/dh = 1/4 h² or dh/dV =4(12v)-²/³
dh/dt = dh/ dV× dV/dt = 4/h²×20
(dh/dt )= 4/10²×20 ×20 = 0.8 or equivalent fraction.
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