Let's solve the two expressions to unlock the box.

Expression A:

$10 - 2 + 8$ We solve this left to right:

1. $10 - 2 = 8$
2. $8 + 8 = 16$

So, the result of Expression A is 16.

Expression B:

$4 + 3 \times 5$ Here, we apply the order of operations (PEMDAS: Parentheses, Exponents, Multiplication and Division, Addition and Subtraction). Multiplication comes before addition:

1. $3 \times 5 = 15$
2. $4 + 15 = 19$

So, the result of Expression B is 19.

Code:

The final code would be 1619.

Would you like further details on how these expressions were solved or any other questions?

Here are 5 related questions for practice:

1. What is the value of $12 - 4 + 6$?
2. Solve $5 + 6 \times 2$.
3. Simplify $9 + 3 - 2 \times 4$.
4. What is the result of $8 \times 2 + 5$?
5. Solve $7 + 8 - 3 \times 6$.

Tip: Always remember to follow the order of operations (PEMDAS) when solving expressions with multiple operations.