1. Develop a general pollutant model for the amount of biphenyl bpresent in the river and a general oxygen model for the amount of oxygen xin the river, both measured in ppm, and both as functions of time r(measured in hours after release). 2. Develop two specific pollutant models using two possible ratesR(t)at which the farm releases biphenyl into the water: (1) a constant rate, and (2) a sinusoidal rate that has an amplitude equal to the constant release rate. The model with the sinusoidal rate should be