exam Maths Puzzle Numerical Ability

Evaluate b^2-2bc+c^2 if b=3 and c-2.

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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 yes i can not figure out how to do this problem please help