exam Maths Puzzle Numerical Ability

solve for x
3x/(x-1)-2/(x+2)=3

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The depreciation of a recent investment is modeled by the function, y=275(0.95)^x. What is the rate of depreciation, expressed as a percent? Can someone please explain? I am new to this subject and have found myself in over my head. I am required to evaluate each of the functions below at x = 1, 2, 4, 8, and 16. Plot the graph of each function. T