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Q4. (a) The value, £C, of a piece of machinery after t years is given by: C = 92000 e^0.205t

Calculate the number of complete years before its value falls to less than £18.000. (6)

(b) solve for x in the following equation:

log4x⁵ - log x = log 16x + log2 (5)

(c) Evaluate the following expression for A without using tables or calculator:

A = (4 log 9  -  2 log 27  +  log 243)/(7 log 3) (5)