To solve the problem in Question 7:

Expression:
$(-3)^2 + (-2)^3 \div 2 + 15$

Step-by-Step Solution:

1. Evaluate $(-3)^2$: $(-3)^2 = 9$

2. Evaluate $(-2)^3$: $(-2)^3 = -8$

3. Divide $(-8) \div 2$: $-8 \div 2 = -4$

4. Combine all terms: $9 + (-4) + 15$

5. Simplify the expression: $9 - 4 + 15 = 20$

So, the correct answer is C) 20.

Would you like further clarification or details on any of these steps?

Here are some related questions for practice:

1. How would the result change if the expression were $(-3)^3 + (-2)^3 \div 2 + 15$?
2. What is the result of $(-4)^2 + (-3)^3 \div 3 + 10$?
3. How does the answer change if we use $(+3)^2$ instead of $(-3)^2$?
4. What is the answer if you divide by $4$ instead of $2$ in the expression?
5. How would you solve if the last term was subtracted instead of added, such as $+ (-15)$?

Tip: Always follow the order of operations (PEMDAS: Parentheses, Exponents, Multiplication/Division, Addition/Subtraction) to ensure accurate results.