9x - 4(x - 2) =x + 20
We move all terms to the left:
- 9x -4(x - 2) - (x + 20) = 0
Multiply
- 9x - 4x -(x + 20) + 8 = 0
We get rid of the parentheses.
We add all the numbers and all the variables.
We move all terms containing x to the left hand side, all other terms to the right hand side
The equation that can be used to find the height of the tree is as follows:

The height of the tree is 35.6 m
<h3>How to use sine rule to find height of the tree?</h3>
Th equation that can be used to find the height of the tree uses the principle of sine rule.
Therefore,


Therefore,

cross multiply
h sin 147 = 40 sin 29°
h = 40 sin 29° / sin 147
h = 19.3923848099 / 0.54463903501
h = 35.6015636045
h = 35.6 m
learn more on sine rule here: brainly.com/question/15221233
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Answer:
28 degrees maybe
Step-by-step explanation:
I dont have a picture but if it's a supplementary line than it has to be equal to 180