exam Maths Puzzle Numerical Ability

Could you tell me how to solve the following question: For a particular salmon population, the relationship between the number "S" of spawner and the number "R" of offspring that s

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Can you please help me by completing the square?
2x^2-4x-3=0
The value of a computer depreciates at the rate of 18% per year. If the computer is now worth $1600, find its value 20 months ago. Give your answer to the nearest dollar. What am I supposed to do?