Ryan conducted a 6-day study observing the effects of an organic plant food on the growth of his sprouting bean plant. he tracked these two pieces of information:
the amount of plant food remaining in the container after each days feeding
the height of the plant over time
ryan found that the amount of plant food remaining decreased an equal amount of each day, and he used the entire 72 milliliters by the end oh his study.
which statement is true about the relationship between the amount of plant food remaining and the number of days?

this relationship is not a function because only one amount of plant food remains each day

this relationship is not a function because more that one amount of plant food remains each day

the relationship is a function because more than one amount of plant food remains each day

the relationship is a function because only one amount of plant food remains each day