Suppose the electric company charges $0.50/kilo-watt-hour. calculate how much does it cost to operate the electric heater described above for 6 hours a day for 30 days.

Ateacher gives students four liquids commonly found in the kitchen - vinegar, apple juice, dish detergent, and milk - and ph indicator strips, which measure acidity. the teacher asks the students to put the liquids in order from most acidic to most basic. what type of investigation could the students conduct to determine the correct order for the liquids?