Geometry

Question Analysis:
Tests understanding of composition of isometries and their properties.

Key Concept Explanation:
Composition: Performing one isometry after another.
Result: Always another isometry (since distance preservation is maintained).

Step-by-Step Solution:
Reflection over y-axis: Isometry (preserves distances).
Translation 3 units left: Isometry.
Combination: Still an isometry.

Option Analysis:
A: Incorrect—number of steps doesn’t affect isometry.
B: Correct—both steps are rigid motions.
C: ...