Consider the two tanks shown in the figure below. Assume that tank A contains 100 gallons of water in which 25 pounds of salt is dissolved. Suppose tank B contains 100 gallons of pure water. Liquid is pumped into and out of the tanks as indicated in the figure; Let X₁ and X₂ be the amount of salt as functions of time t in tanks A and B respectively. Find a system of first order equation for the amounts of salts X₁ and X₂, including the initial conditions for the system. Do not Solve the system. A 100 gal mixture 3 gal/min mixture 2 gal/min B 100 gal

3. Solve. x – 4 5 64 x +4 x - 16 O A. {-9} O B. {9} C. {-4, 4} O D. {4}

Solve. 1 5 8 5x + 20 x - 16 X- 4 Select the correct choice below and, if necessary, fill in the answer box to complete you