if the average distance from the sun to the earth is 1.49668992 x 10^11 m and the speed of light in a vacuum is 2.99792458 x 10^8. how long does it take light to travel from the sun to the earth to the nearest tenth of a second?

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?