exam Maths Puzzle Numerical Ability

If the diameter of a circle is 1.3x10^-12 meters, then what is its radus?

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exam Other Question

Logarithms:
a) Using a calculator, find log 1000 where log means log to the base of 10.

b) Most calculators have 2 different logs on them: log, which is base 10, and ln, which
Factor Completely

9x^2 + 12xy + 4y^2 - 25