How to Calculate Percentage Error in Scientific Measurements?

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Shawn-Kgn
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i have these two question i need help

1. given y=3x2 find the percentage error in y if there is a 3.5% in the calculation of x



2. the volume of a sphere is give by V= 4/3 pie r3. find the percentage error in the volume when there is a 2% error in the radius
 
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What have you tried? What is the formula for percentage error in terms of differentials?
 

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