A tank contains 9,000 L of brine with 16 kg of dissolved salt. Pure water enters the tank at a rate of 90 L/min. The solution is kept thoroughly mixed and drains from the tank at the same rate. (a) How much salt is in the tank after t minutes

kg

Step-by-step explanation:

We are given that

Volume,V=9000 L

We have to find the salt in the tank after t minutes.

Let  y(t) be the amount of salt dissolved in the tank

y(0)=16

rate in-rate out

Rate in=0

Rate out=

Where

Substitute t=0 and y=16

kg

this is the formula: v = the value of investment at the end of the time period

p = the principal amount (the initial amount invested)

r = the annual interest rate

n = the annual frequency of compounding (how many times a year interest is added)

t = the number of years the money is invested

^ means raise to the power of

30,40,50 is correct answer