Which equation describes the sum of the two vectors plotted below?

The density of a liquid could be found by using

The slope of a velocity time graph over any interval of time gives the during that interval

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?