Kburg - Rob...
Look at the two sums shaded in the addition table. Why are the sums the same?

4x 20 is 80 but if ther machine is broken then there is none you have to redo the test

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