Answer:
The required value of a is 
 
Explanation:
Given : Suppose the graph of the parent function 
 is vertically compressed to produce the graph of the function 
 but there are no reflections. 
To find : Which describes the value of a? 
Solution : 
When the graph is vertically compressed by unit a 
then the value of a lies between 
 
So, In the graph of parent function 
 is vertically compressed to produce the graph of the function 
 the value of a lies between 
 as there is no reflection so no changes.
Therefore, The required value of a is