What is the solution of StartRoot negative 4 x EndRoot = 100?

Witch represents the inverse of the function f(x)=1/4x-12

Solve this problem! extra ! 3025/5.5 = a/90.75 / = fraction

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