The discharge rate of a river is a measure of the river’s water flow as it empties into a lake, sea, or ocean. The rate depends on many factors, but is primarily influenced by the precipitation in the surrounding area and is often season Suppose the discharge rate of the Brhamputra River was modelled by D(m)=-m4 +22m3 -147m2 +317m+150 where D(m) represents the discharge rate in thousands of
cubic meters of water per second in month m .
( m = 1 " Jan, m = 2 " Feb )
61. What was the discharge rate in June (summer)