Which representation of a transformation on a coordinate grid does not preserve congruence? A. (x, y) → (2x, 2y)
B. (x, y) → (x+6, y−2)
C. (x, y) → (−y, x)
D. (x, y) → (−x, y)

If the slope of one line equals the slope of another line then ? a) the two lines are intersecting lines b) the two lines are perpendicular lines c) the two lines are parallel lines d) the two lines always have very steep slopes

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)