Answer:
(a)

(b) The amount by which the first movie made more than the sequel is $0.8 million.
Explanation:
It is provided that:
- The Avengers movie made $1.6 million in ticket sales.
- The sequel made $0.8 million in ticket sales.
(a)
The equation representing the amount by which the first movie made more than the sequel is:

(b)
Compute the difference value as follows:

Thus, the the amount by which the first movie made more than the sequel is $0.8 million.