The concentration rate of a toxic agent discharged into a river can be approximated by the following mathematical model, dc where V=1 x 106 m³ V dt = W-Qc-kV√c Q = 1 x 105 m³/yr W = 1 x 106 g/yr k = 0.2 g0.5/m1.5yr If the concentration of the toxic agent, c is constant, determine its value using Newton Raphson and Secant methods with &, = 0.1 %.