Answer:
A) 
Step-by-step explanation:
An equation is a function of 
when is the independent variable, that is:
(1)
Where 
is the dependent variable.
According to this, does not represent a function of , since the independent variable is a function of , that is, 
. Therefore, the correct answer is A.
Answer: x=80°
Explanation:
To find the exterior angle x we first need to find the last corner angle (a) of the triangle. The angles of triangles add up to 180° so we can use the formula: 25+55+a=180
Solving formula:
25+55+a=180
80+a=180
(Subtract 80 from both sides)
a=100°
Now that we know a=100 we can find the exterior angle. a+x=180 because the angles are on a straight line which equals 180°
a+x=180
100+x=180
(Subtract 100 from both sides)
x=80°
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X = 3
Combine like terms: -4 + -5 = -9
-9 + 6x + -3x = 0
Combine like terms: 6x + -3x = 3x
-9 + 3x =0
Solving -9 + 3x = 0
Solving for variable ‘x’
Moving all terms containing my x to the left, all other terms to the right
Add ‘9’ to each side of the equation -9 + 9 + 3x = 0 + 9
Combine like terms: -9 + 9 = 0
0+3x=0+9
3x = 0 + 9
Combine like terms: 0 + 9 = 9
3x = 9
Divide each side by ‘3’.
X = 3
SORRY THIS IS SO LONG
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