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Please help me with questions 8 and 9

Please help me with questions 8 and 9-example-1

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Problem 8

Answer: Choice A
Coordinates have been multiplied by a scale factor of 0.5

For instance
A = (-3, 4)
Multiply the coordinates by 0.5 to get
-3*0.5 = -1.5
4*0.5 = 2
So the coordinates of A' are (-1.5, 2) which is what matches what we're given above. The same will happen with B and C as well.

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Problem 9

Answer: choice C) x = 25; larger angle is 107 degrees

Work Shown:
(3x+32)+(x+48) = 180
4x+80 = 180
4x = 100
x = 25
If x = 25, then,
3x+32 = 3*25+32 = 107
x+48 = 25+48 = 73
So the larger angle is 107

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