Answer:
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Step-by-step explanation:
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Coordinates of midpoint are
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The figure is right triangle.
The circumcenter is the middle of the hypotenuse.
( - 2, 4 )
( 1 , - 1 )
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11) 7 + -10+(4(5+-3)) = 7+-10+8=5
12) (12 +-10)+3x+-1(2x+4x), 12+-10x+3x+-2x+-4x = 12+-13x
The thirtieth person will receive a free t-shirt and Keychain.
3 × 10 = 30