For a Tuscan elephant, heart rate r in beats per minute and
life span s in minutes are related to body mass m by the functions r(m) = 231m^{-0.25}
and s(m) = 72m^{0.6}. Find the product of r(m) and s(m):

231m^{-0.25}× 72m^{0.6}= 16,632m^{0.35}