I'm working on two problems that I need help on.

(1) The radius of a circle is to be measured and its area computed. If the radius can be measured to an accuracy of 0.001 in and the area must be accurate to 0.1in^2, estimate the maximum radius for which this process can be used.

(2) If pV=20 and p is measured as , estimate V.

Here are the formulas I have been using for these problems (out of Schaum's Calculus, 4th ed.):

I'm not requesting that someone work out the problems for me, just help me with where to start. Thanks