Water is added or drained from a tank each day. The first day, 910 of a gallon is added to the empty tank. The second day, 810 of a gallon is drained from the tank. The third day, 710 of a gallon is added to the tank. The fourth day, 610 of a gallon is drained from the tank. The amount of water in the tank after nine days is given by 910+(−810)+710+(−610)+⋯+310+(−210)+ 110.

How much water is in the tank after nine days? Write your answer as a decimal.

Adoctor administers a drug to a 38-kg patient, using a dosage formula of 50 mg/kg/day. assume that the drug is available in a 100 mg per 5 ml suspension or in 500 mg tablets. a. how many tablets should a 38-kg patient take every four hours? b. the suspension with a drop factor of 10 ggt/ml delivers the drug intravenously to the patient over a twelve-hour period. what flow rate should be used in units of ggt/hr? a. the patient should take nothing pills every four hours. (type an integer or decimal rounded to the nearest hundredth as needed.)