Ii.) 2 ( x + 3 ) = 15

2(x+3)=15

2x+6=15

2x=9

x= 4.5

Step-by-step explanation:

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step-by-step explanation:

∆abc has the points a(1, 7), b(-2, 2), and c(4, 2) as its vertices. formed with the point d(1, 2) as its third vertex, then ∆abd is triangle.