50 POINTS

explain the meaning of the following points
(1,2)
(9,18)

(1,2) in one day, the plant was 2 mm tall.

(9,18) in nine days, the plant was 18 mm tall.  

Step-by-step explanation:

(1,2) in one day, the plant was 2 mm tall.

(9,18) in nine days, the plant was 18 mm tall.  

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16 quarts

Step-by-step explanation:

16 quarts is bigger than 2 gallons because every 4 quarts equals 1 gallon.