Hello NVGAM:
Since all of the values are given, there are no unknowns. So, the expression will simply show the multiplications and additions of the given numbers.
Evaluation is doing the arithmetic (using the Order of Operations).
For example, one dime is worth 10 cents, one nickel is worth 5 cents, and 1 quarter is worth 25 cents. I have 4 dimes, 3 nickels, and 2 quarters, in my pocket. Write and evaluate an expression for the total number of cents.
The expression: 4*10 + 3*5 + 2*25
The evaluation: 40 + 15 + 50 = 105
I have 105 cents, in my pocket.
Your exercise follows the same line of reasoning.
If you still need help, then please ask specific questions or show whatever work that you can, so that we might determine where to continue helping you.
Cheers,
~ Mark