△ABC is reflected across the y-axis. The result is labeled △DEF. What must be true of angles A and D? ∡A is one−half of ∡D.

∡A is twice ∡D.

The angles are congruent.

angles remain congruent

Step-by-step explanation:

all transformations, except dilations, do not change lengths of sides or angle measures

he has now walked a total of what?

if i know what this is maybe i can

step-by-step explanation:

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,