Question

2b now plot point $a$, a reflection of point $a$ across the $x$-axis.

Explanation:

Step1: Identify coordinates of A

Point A is at $(4, 5)$

Step2: Apply x-axis reflection rule

For reflection across x-axis, $(x,y)\to(x,-y)$. So $A'=(4, -5)$

Answer:

Point $A'$ is located at coordinates $(4, -5)$ (plot this point on the grid at x=4, y=-5)