Answer:

Step-by-step explanation:
Here first open the inner parentheses and use the distributive property,

Answer:
2
Step-by-step explanation:
y + 12 = 7y
<em>isolate variable</em>
12 = 6y
<em>divide both sides by 6</em>
2 = y
Answer:
Put the X on the 3rd box down
Step-by-step explanation:
Answer:
1.) 90 degrees. The line<em> a</em> is parallel to line <em>c </em>which is perpendicular to the other line, <em>b</em>
Step-by-step explanation:
Since we know that <C is congruent to <E, we can say that: A. the two triangles are similar by SAS.
<h3>The properties of similar triangles.</h3>
In Geometry, two triangles are similar when the ratio of their corresponding sides are equal in magnitude and their corresponding angles are congruent.
Ratio = BC/AC = 6/3 = 2.
Ratio = FE/DE = 4/2 = 2.
Thus, the ratio of their corresponding sides are equal in magnitude i.e BC/AC ≡ FE/DE.
Since we know that <C is congruent to <E, we can say that the two triangles are similar by side, angle, side (SAS) criterion.
Read more on congruency here: brainly.com/question/11844452
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