(1 point) a fish tank initially contains 15 liters of pure water. brine of constant, but unknown, concentration of salt is flowing in at 5 liters per minute. the solution is mixed well and drained at 5 liters per minute. a. let x be the amount of salt, in grams, in the fish tank after t minutes have elapsed. find a formula for the rate of change in the amount of salt, dx/dt, in terms of the amount of salt in the solution x and the unknown concentration of incoming brine c. dx grams/minute b. find a formula for the amount of salt, in grams, after t minutes have elapsed. your answer should be in terms of c and t. x(t)= grams c. in 10 minutes there are 25 grams of salt in the fish tank. what is the concentration of salt in the incoming brine? c = g/l