exam Maths Puzzle Numerical Ability

Stephen purchases a used car for $8000 knowing it will depreciate in value by 10% each year.Calculate the common ratio between successive values for the first four years.Determine

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exam Other Question

If f(x) is defined over [0,1] then what is the domain of the function f(2x+3)? Can you help me with rationalizing the denominator on the following:
5 on the top, fraction bar, 9 minus radical sign 3 on the bottom (the 3 is under the radical sign)