exam Maths Puzzle Numerical Ability

express as a single logarithm:

(a) 3log(x-2)+ 1/2 log(x)

(b) log(3xy)- log(x)

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exam Other Question

(ln5^-5)(ln(2/6^(4)))^-5 Please help w/ the following. Thank You.

If 10,000 is invested at 9% compounded monthly for 6 years the compounded amount is given by A=10,000(1.0075)^72. Given that log 1.0075=0.00325, find log A. (Note that 10,000=10^4).