Answer:
a.
b. 
Step-by-step explanation:
You need to remember that:
1. The word "more" indicates Addition.
2. The "Difference" is the result of a Subtraction.
a. Then, knowing this information, you know that:
- "The difference of
and
" must be expressed as:

- Then, "Three more than the difference of
and
" is:

- "The difference of
and
" can be expressed in this form:

Therefore, "Three more than the difference of
and
is equal to the difference of
and
" is:
b. Solve for "s" in order to find its value:
