exam Maths Puzzle Numerical Ability

3(x+2)-5=2x+7

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31=-1/6m
multiply both sides by -6
-1/6m X -6 = 1m
-6 X 31 =-186
m= -186 a) Randolf bought a high-end computer system for $4800. The system depreciates at the rate of 25% each year.
Determine an exponential funciton to model the value of the system ov