book Maths Puzzle Numerical Ability

How do I write the mathematical definition for a logarithm, like for
logb N?

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book Other Question

add one line to make this stament true
101010=9.50
eg you can add a line to make 1 , +
or just add a one in between
or put a minus between two numbers How do I find missing angle measures when I only have 1 angle measure such as 70 degrees or 25 degrees or 30 degrees?