Can someone answer???Idk what to put in the boxes I’ll give brainlist and points

Two rigid transformations are used to map abc to qrs. the first is a translation of vertex b to vertex r. what is the second transformation? a reflection across the line containing ab a rotation about point b a reflection across the line containing cb a rotation about point c

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Whats are the trickiest steps to do when adding or subtracting rational expressions? how does knowledge of rational numbers u in adding and subtracting rational expressions?