Atank contains 225 l of water. a solution with a salt concentration of 0.4 kg/l is added at a rate of 5 l/min. the solution is kept mixed and is drained from the tank at a rate of 3 l/min. if
y(t)
is the amount of salt (in kilograms) after t minutes, show that y satisfies the differential equation
dy/dt = 2 - 3y/(225+2t)
solve this equation and find the concentration after 20 minutes.

1/5

step-by-step explanation:

the dice has 6 sides and there is only one 5 in a dice.

he spend 5.1 minutes chatting with his friends

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5 1/10

answer: evaluate the objective function at each vertex to determine which - and -values, if any, maximize or minimize the function. example: find the minimum value and maximum value of the objective function f ( x , y ) = 4 x + 5 y , subject to the following constraints