Check the picture below, notice, after 0 goes up then down back up at 4, and then it begins repeating after that, it begins to "periodically" be the same curve, that's the period.
Answer:
4,200
Step-by-step explanation:
Look at the tenth's place. (:
There are 1000 millileters in on liter so
5 x 1000=5000
1/2 x 1000= 500
5000 +500= 5500 millliters