Answer:
The expression representing the Total cost of 6 boxes is
.
The Simplified expression representing the Total cost of 6 boxes is
.
Step-by-step explanation:
Given:
Number of thriller movies = 3
Number of Comedy movies = 2
Let the cost of thriller movie be t
Also Let the cost of comedy movie be c
Total Number of boxes = 6
Now, given a DVD box set includes 3 thriller movies and 2 comedies.
Cost of Each box = 
We need to find the total cost of 6 boxes
Total Cost of 6 boxes is = 
Hence the expression representing the Total cost of 6 boxes is
.
Simplifying the above expression we get;
Total Cost of 6 boxes is = 
Hence the Simplified expression representing the Total cost of 6 boxes is
.