Find the intervals on which f(x) is increasing, the intervals on which f(x) is decreasing, and the local extrema. f(x) = 5x4/7 - x5/7
Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
O A. The function is increasing on
(Type your answer using interval notation. Use a comma to separate answers as needed.)
B. There is no solution.

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