The answer is zero.
If any of the pairs of lines were parallel, there would be some same-side interior angles or such that would be supplementary. However, since the lines are not parallel lines crossed by a transversal, the only ones guaranteed to be supplementary to angle 7 are the ones adjacent to it that form a linear pair.
ANSWER

EXPLANATION
We want to find the equation of the straight line given on the graph.
The general form of a linear equation is given as:

where m = slope; b = y-intercept
To find the slope, we apply the formula for slope:

where (x1, y1) and (x2, y2) are two points on the line
Let us pick (1,2) and (4,4)
Therefore, the slope is:

To find the equation, we now apply the point-slope formula:

Therefore, we have that the equation of the line is:

That is the equation of the line.
Answer:
67.4 J
Step-by-step explanation:
F = ma
5.6 = m(12)
mass of the boy = 7/15 kg
KE = (1/2)mv^2
KE = (1/2)(7/15)(17^2)
KE = 67.4 J (3 sig. fig.)
All of the equations equal to y
Y=mx+b
Y= 3x+8
3= slope= m
8=y intercept= b