After buying 20 glasses bowls for 10 trailer sold them at 15 each what was his gain percent​

Idon't see any graph, however the graph of the function : f(x) = x²-2x+3 is a parabola: 1) open upward (since a> 0)2) it intersects y-axis in 3 (y=3)3) its axis of symmetry is x = +1 ( -b/2a)4) it's minimum is y = -2, so its vertex is (1,-2)5) it doesn't intersect the x-axis since discriminant < 0 

What’s your question?

given that    bisects ∠dbc, which statement must be true? the answer is:   m∠abd = m∠abc