The answer to your question is below this
Answer:
What is the question?
Step-by-step explanation:
In the given triangle we have the following:
A. The sum of the inner angles of a triangle is always equal to 180, that is:

From this, we can solve for the sum of angles 1 and 2 and we get:

Now, we also know that angles 3 and 4 are supplementary angles and therefore their sum is 180 degrees, that is:

Solving for angle 4:

Equating both results we get:

Therefore, it is true that angle 4 is the sum of angles 1 and 2.
B. We have that the sum of angles 2 and 3 is:

If this were equal to angle 4 we would have:

B
Answer:
I type a little weird sometimes... try your best to read it.
Step-by-step explanation:
3
9
=
7
−
2
(
5
−
3
)
39
=
7
x
−
2
(
5
x
−
3
)
39=7x−2(5x−3)
3
9
=
7
−
1
0
+
6
Answer:
20:a , a=48
Step-by-step explanation:
5*4=20, 12*4 = 48
Simple mathematics, you multiple 5 by 4 to get 20, do the same thing to 12.