The coefficient is a number that is placed in front of the variable for which It is being multiplied to. In this case it would be 5.
Constants are values that can be thought of as the opposite of coefficients in that they do not have any other variables or letters and thus they include only a number.
Their value does not change.
Answer: 150
We know that cos Ф = sin (90 - Ф)
If Ф = 150, then:
cos 150 = sin (150 - 90)
cos 150 = sin 60
Using the equation they gave us:
cos 150 = sin ( 
- 10)
cos 150 = sin 60
Answer:
100, because 180 - 50 - 90 = 40
The vertical angles theorem is applied, so now angle DCE is 40
And since CE = ED, its isosceles triangle, so base angles are equal, so 40 and 40.
180 - 80 = 100 = Angle E.
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