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Step-by-step explanation:

for 2 lines to be parallel they must have the same angles with a crossing third line.

and it is a given for 2 crossing lines that the

top right angle = bottom left angle

top left angle = bottom right angle

it is also clear that the sum of all angles around a single point in one side of a line must be 180° (as the line is the diameter of a potential circle with the single point being the center of that circle, and so one side of the line represents a half-circle = 180°).

7.

angle 3 plus angle 8 are together 180°.

66 + 2x + 8 = 180

2x + 8 = 114

2x = 106

x = 53

8.

3x + 48 = 6x

48 = 3x

x = 16

8496 cars

step-by-step explanation:

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.