exam Maths Puzzle Numerical Ability

This is really stumping me can you help?
Use common logarithms and a calculator to evaluate to four decimal places:
log612 (it is a lower six)

Thanks in advance

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exam Other Question

A circle is centered at the origin. The coordinates of one end point of a diameter are (3 + square root of 2, -4). What are the coordinates of the other endpoint of the diameter? The problem states.. The value V in dollars, of a shopkeepers inventory software program is given by V= -20t + 250 where t is the # of years since the shopkeeper first bought the program. After how many years is the value of the software $150?