Answer:
The interval over which the function is increasing is:
  (1.25,∞)
Explanation:
We are given a modulus function by:
 

From the graph of the function we see that the function is first decreasing in the interval (-∞,1.25) and then it increases continuously in the interval (1.25,∞) and goes to infinity.
  Hence, the answer is:
 (1.25, ∞)