The flow of a river at the start of a baseflow recession, on June 7, 2018, was 4,790 ft3/s. After 59 days of continuous recession, on August 5, 2018,...

The flow of a river at the start of a baseflow recession, on June 7, 2018, was 4,790 ft3/s. After 59 days of continuous recession, on August 5, 2018, the flow had declined to 1,631 ft3/s. (a) What is the value of the recession constant ? (b) What will the flow be on September 12, 2018, if the recession continues ?