Question

A tank holds 19 gallons. Initially, Mr. Dong put 8 pounds of salt in the 19 gallon tank to create the correct salinity. It is good practice to replace 10% of the water each week. Also each week, one gallon of water evaporates, but no salt is lost, so the tank would then contain 8 pounds of salt in only 18 gallons. After one week, Robin proceeds to add enough fresh water to replace the evaporated water, then removes 1.9 gallons of tank water & adds 1.9 gallons. write a sequence of terms that gives the number of pounds of salt remaining in the tank at the beginning of each week.