810. A tank has pure water flowing into it at 10 1/min. The contents of the tank are kept thoroughly mixed, and the contents flow out at 10 1/min. Salt is added to the tank at the rate of 0.1 kg/min. Initially, the tank contains 10 kg of salt in 100 1 of water. How much salt is in the tank after 30 minutes?

The masses of a measuring cylinder before and after pouring some liquid into it are shown in the diagram. cm cm 200 200 100 100 liquid mass = 80 g mass = 180 g What is the density of the liquid? 120 9/cm B 100 g/cm 180 g/ cm 120 D 180 g/cm 140 B O D O A

2. Given a solid rock found in an archeological dig. The volume of the rock is measured and found to be 100 cm^3. The rock is weighed and found to have a mass of 1000 grams. What is the density of the rock in units of grams/cm^3?   a. 10.0   b. 1000

A Mixture Problem In an oil refinery, a storage tank contains 10,000 [L] of gasoline that initially has 50 [kg] of an additive dissolved in it. In preparation for winter weather, gasoline containing 0.2 [kg] of additive per litre is pumped into the tank at a rate of 200 [L/min]. 200 L/min containing 0.2 kg/L 220 L/min containing kg/L Where y is the amount of chemical in the container at time t, and V is the total volume of liquid in the container at time t, a) Write a formula V(t) for the capacity (volume) of the tank at any time. b) Find the domain of V for this problem. c) Find the rate of incoming additive in [kg/min]. d) Find the rate of outgoing additive in [kg/min]. e) Express the rate of change of the amount of chemical in the container at time t in its standard form. f) Calculate how much of the additive is in the tank 25 minutes after the pumping process begins.