Atank contains 50 kg of salt and 2000 l of water. a solution of a concentration 0.0125 kg of salt per liter enters a tank at the rate 7 l/min. the solution is mixed and drains from the tank at the same rate.
(a) find the amount of salt in the tank after 3.5 hours.
(amount in kg)
(b) find the concentration of salt in the solution in the tank as time approaches infinity.
(concentration in kg/l)

a. 36.9876kg of salt

b. As time reaches infinity, the concentration of salt will equal the amount of salt going in (0.0125kg/L)

Step-by-step explanation:

View Image

the arc length is found by finding the circumference of the full circle (2xpixradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).

$655.61 which is option c

step-by-step explanation:

price of house =   $146,000

initial rate = 3.5%

mortgaged paid in this = 3.5 % of $146,000

                                        =

                                        =$5110

the total years would be = 7

total mortgaged paid = 7 * $5110

                                      =$35770

remaining money = $146000-35770

                                =$110230

new mortgaged payment = 5 % of 110230

                                            =  

                                            =$655.61