How to Calculate Percentage Error in Scientific Measurements?

[Shawn-Kgn]

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

 

[LCKurtz]

What have you tried? What is the formula for percentage error in terms of differentials?