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( 1)∵y = 0.0225 x2+0.9x+ 10，

∴ Vertex coordinates are x=-0.92×0.0225=-20, y=4×0.0225× 10? 0.924×0.0225= 1.

So the distance from the lowest point of the cable to the bridge deck is 1 m;

(2) Because the two parabolas are symmetrical about the Y axis,

So in the right picture, the abscissa of the vertex is 20,

So the distance between the lowest points of two steel cables is 40 meters.

(3) Because the two parabolas are symmetrical about the Y axis,

So in y=0.0225x2+0.9x+ 10,

When x=-x and y = 0.0225x2-0.9x+ 10.