exam Maths Puzzle Numerical Ability

I am trying to evaluate expressions with logs, the problem that I am stuck on is log2 1/8 (Log of 2 and 1 eightth).

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exam Other Question

-1/2 I6x-3I < or equal to -3/2 The distance between the road of a bridge and the top part of its arch is 3m. If the arch of the bridge is given by the equation h(x)= 7x-x^2. Find the height of the bridge