What is the transformed equation of f (x) = |x-4| + 1 after reflected over the x-axis?

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

Determine if the equation defines y as a function of x: 2xy = 1. yes o no

How can you find the mean absolute deviation (mad) for this set of data?