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Let's start by addressing the two questions shown in your images:

### 1. **Question 18:**
   - Given \( p(x) = x + 3 \), the task is to find \( p(x) + p(-x) \).

   **Step-by-step Solution:**
   - First, find \( p(x) \):
     \[
     p(x) = x + 3
     \]
   - Now, find \( p(-x) \):
     \[
     p(-x) = -x + 3
     \]
   - Add \( p(x) \) and \( p(-x) \):
     \[
     p(x) + p(-x) = (x + 3) + (-x + 3)
     \]
     \[
     p(x) + p(-x) = x - x + 3 + 3 = 6
     \]
   - Therefore, the correct answer is **6** (Option d).

### 2. **Question 23:**
   - The equation is \( 7x + y

If p(x) = x + 3, then p(x) + p(-x) is equal to

Learn how to solve the function p(x) + p(-x) where p(x) = x + 3. This problem explores algebraic functions and is suitable for students in grades 9-10.

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