7) A tank contains 1600L of brine with 10 kg of dissolved salt. Brine consisting of 0.2 kg of salt per liter is being pumped into the tank at a rate of 20 L/min . The solution is kept thoroughly mixed and drains from the tank at a rate of 20 L/min. Provide the differential equation that models the amount of salt in the tank at any given time and nd how much salt is in the tank after 80 minutes? 8) ( Multiple Choice ) Which of the following is a particular solution to the following differential equation: y "-6y'-27y = 0 A) y = e * + p -3x By = ex C y = e'x Dy = ex E y = e27x F) y = x