Which statements identify appropriate units of measure for the given situation?

The ratio of mass to volume could be represented by
grams
milliliter
.
The ratio of the number of cavities to the volume of soda consumed could be represented by
cavities
cm
.
The growth rate of moss to the volume of rainfall could be represented by
square meters
week
.
The volume of fuel used as the area mowed increases could be represented by
L
m2
.

With #! i’ve tried to figure it out but i can’t.

An automated water dispenser fills packets with one liter of water on average, with a standard deviation of 5 milliliter. the manual says that after a year of operation the dispenser should be tested to see if it needs recalibration. a year later a number of filled packets are set aside and measured separately. it is found that the average packet now contains about 0.995 liters. does the dispenser need calibration? explain your answer.

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?