Answer:

Step-by-step explanation:
The diagram shows three paralel lines which divide the large triangle into three similar triangles.
By Thales theorem,

Then

From the similarity of triangles,

4.36 I think I hope this helps
Answer:
143°
Step-by-step explanation:
=90°+53°
=143°
Answer:
see explanation
Step-by-step explanation:
(1)
given
4x² = 81 ( divide both sides by 4 )
x² =
( take the square root of both sides )
x = ±
= ± 
---------------------------------------------------------------------
(2)
subtract 7 from both sides
(4x - 3)² = 32 ( take the square root of both sides )
4x - 3 = ±
= ± 4
Add 3 to both sides
4x = 3 ± 4
( divide both sides by 4 )
x =
± 