exam Maths Puzzle Numerical Ability

solve -2x/sqrt(x+1)+4sqrt(x+1)

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A reduced fat cookie contains 5 grams fat per serving. In order for food to be 'reduced fat', it must have at least 15% less fat than the regular item. What can you conclude abou 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?