exam Maths Puzzle Numerical Ability

Certain machine cost $40,000. Now, after 9 years it costs $2,000. How much did it cost 3 years ago? How much does it depreciate per year?

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exam Other Question

solve -2x/sqrt(x+1)+4sqrt(x+1) The process of writing a quadratic equasion in the form (x + a)^2 = b is known as?__________________________
(PS: Please show how you worked it out. I have been having mojor problems with these kinds of questions. Thanks.)