Andros has an oil fired heating system. In a 30-day period he used a full tank of oil at a constant rate per day. At a different time of the year the amount of oil Andros uses per day is 1 3 of the rate used in the 30-day period. (a) How many days should a full tank of oil?

The customer price index(cpi), which measures the cost of a typical package of customer goods,was 208.8 in 2011 and 244.1 in 2016.let x=11 corresponding to the year 2011 an estimate to cpi into 2013 and 2014. assume that the data can be modeled by a straight line and the trend to continue idenfinitely.use data points to find such a line and then estimate the requested quantities