Please help me with part b of this question. Thank you in advance!!

Agood for which demand increases as income rises is and a good for which demand increases as income falls is

Alarge tank is filled to capacity with 500 gallons of pure water. brine containing 2 pounds of salt per gallon is pumped into the tank at a rate of 5 gal/min. the well-mixed solution is pumped out at the same rate. find the number a(t) of pounds of salt in the tank at time t.

Why is following an unrelated diversification strategy especially advantageous in an emerging economy? a. it allows the conglomerate to overcome institutional weaknesses in emerging economies. b. it allows the conglomerate to form a monopoly in emerging economies. c. it allows the conglomerate to use well-defined legal systems in emerging economies. d. it allows the conglomerate to take advantage of strong capital markets in emerging economies.