Which tool or tools would you use to measure and compare the mass of a cup of fresh water and a cup of salt water

You could use a scale to measure the mass as well as a cup to hold the water. If you were comparing the two, you should also probably use a graduated cylinder to get the same amount of each type of water.

Hope this helped ^_^

B"hf and f-"  is the correct answer took the test on edgenuity and got it right     

H tricky one let me think and get back to u