What's the next letter? y b w d u f

Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1

Aline has a slope of . which ordered pairs could be points on a parallel line? check all that apply. (-8, 8) and (2, 2) (-5, -1) and (0, 2) (-3, 6) and (6, -9) (-2, 1) and (3,-2) (0, 2) and (5,5)