A county realty group estimates that the number of housing starts per year over the next three years will be H(r) = 200/ (1+0.03r) where

A county realty group estimates that the number of housing starts per year over the next three years will be H(r) = 200/ (1+0.03r²) where r is the mortgage rate (in percent).(a) Where is H(r) increasing?(b) Where is H(r) decreasing?