60% how can be 0.6? can someone explain

Which of the following transformations does not preserve congruence? * 5 points a. (x, y) → (y − 3, x − 3) b. (x, y) → (x + 5, y − 1) c. (x, y) → (y + 9, −x + 2) d. (x, y) → (3x + 1, 3y − 2)

Fractions can be added and subtracted only if they're fractions. a. like b. proper c. improper d. unlike

The parabola opens: y=√x-4 (principal square root) up down right left