Help!! pls include steps, i’m really confused on how to continue this problem (no links)

12. decide whether each statement is always true, sometimes true, or never true. a. when corresponding points of an original figure and its reflection are connected, the resulting segments are all perpendicular to the line of reflection. b. when a point is reflected over a horizontal line, the y-coordinate of the point stays the same. answer both questions and explain

Choose the more precise measurement. 26.4 cm or 8.39 cm

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b