Fran purchased an annuity that provides $5,400 quarterly payments for the next 10 years. The annuity was purchased at a cost of
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Answer:
Step-by-step explanation:
A tank contains 240 liters of fluid in which 20 grams of salt is dissolved.
- Volume of the tank = 240 liters
- Initial Amount of Salt in the tank, A(0)=20 grams
Brine containing 1 gram of salt per liter is then pumped into the tank at a rate of 6 L/min
(concentration of salt in inflow)(input rate of fluid)
(concentration of salt in outflow)(output rate of fluid)
Rate of change of the amount of salt in the tank:
We then solve the resulting differential equation by separation of variables.
Taking the integral of both sides
Recall that when t=0, A(t)=20 (our initial condition)