What is the value of n? 9x27 +2×31-28=n

Need on this one asap im almost done with this subject

The frequency table shows a set of data collected by a doctor for adult patients who were diagnosed with a strain of influenza. patients with influenza age range number of sick patients 25 to 29 30 to 34 35 to 39 40 to 45 which dot plot could represent the same data as the frequency table? patients with flu

Joe has some money in his bank account he deposits 45$ write an expression that represents the amount of money in joe's account