Astudy analyzed the average yearly salt intake in the united states from 2012 thru 2017. the data is summarized in the table: year annual salt intake (grams) 2012 3,554 2013 3,598 2014 3,603 2015 3,655 2016 3,718 2017 3,794 the study found that the data after the year 2012 can be modeled by the function f(x) = 52.3x + 3,548, where x is the number of years since 2012 and f(x) is the total amount of salt ingested in grams. describe the significance of 3,548. an estimate of the grams of salt used in 2012 an estimate of the grams of salt used in 2013 the average amount of salt in grams used in 2012 the average amount of salt in grams used in 2013