△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.

Plz help plz give me the answer

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )