Use differentials to approximate the error and relative error in using the given measurement to calculate the value of the function, if the measurement may be off by the specified amount.

I just need approximate relative error for both.

(a) Using volume V = 4 m3 for the pressure P = 180/V of a gas in a balloon if the volume may be off by 0.2 m3

(b) Using an intensity of I = 64 lumens for the distance D = 100/sqrt(L) of an object from a light source if the intensity may be off by 1.5 lumens

Question

Use differentials to approximate the error and relative error in using the given measurement to calculate the value of the function, if the measurement may be off by the specified amount. 

I just need approximate relative error for both.

(a) Using volume V = 4 m3 for the pressure P = 180/V of a gas in a balloon if the volume may be off by 0.2 m3

(b) Using an intensity of I = 64 lumens for the distance D = 100/sqrt(L) of an object from a light source if the intensity may be off by 1.5 lumens