Someone please help me! What would x be? And why?
Really don’t understand and my brain has officially been turned into a potato .

Step-by-step explanation:

Since ABCD is a parallelogram, we have that DA II CB and AB II DC.

Since DA II CB, by alternate interior angles:

By substitution:

Next, recall that the interior angles of a triangle must sum to 180°. So, for ΔCBE:

Solve for ∠ECB. (Note that ∠CBE and ∠CBD are the same angle.):

Finally, recall that opposite angles in a parallelogram are congruent. That is:

∠BCD is the sum of ∠ECB and ∠ECD (x). Substitute and solve for x:

In conclusion, the measure of x is 19°.

for any of you who need the translation here it is

step-by-step explanation:

find the angular size of the equatorial radius of the earth, if the horizontal parallax of the sun