Answer:
distributive
Step-by-step explanation:
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C: 40 degrees
50+2y+y+10=180
60+3y=180
3y=120
y=40
(AB)²=(AC)²+(BC)²
(AB)²=(4)²+(3)²
(AB)²=16+9
(AB)²=25
hope it helps...
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answer is 20 ..........