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