(a) y =(\(\frac{pr}{m} - p^2r\))\(^{\frac{-3}{2}}\) y = (\(\frac{pr - mrp^2}{m})^\frac{-3}{2}\) y = [\(\frac{m}{pr - mrp^2}]^\frac{3}{2}\) \(y^\frac{2}{3} = \frac{m}{r(p - mp^2)}\) r = \(\frac{m}{y^\frac{2}{3}[p - mp^2]}\) b) Given y = -8, m = 1 p = 3 r = \(\frac{m}{y^\frac{2}{3}[p - mp^2]}\) r = \(\frac{1}{(-8)^\frac{2}{3}[ 3 - (1)3^2]}\) r = \(\frac{1}{(-2)^2[3 - 9]}\) r = \(\frac{1}{[4][-6]}\) = \(\frac{-1}{24}\)