Which quadratic function best fits this data?

x y
1 250
2 289
3 316
4 335
5 320
6 290

y=−9.16x2+73.04x+183.3

y=9.16x2−73.04x+183.3

y=9.16x2+73.04x+183.3

y=−9.16x2−73.04x+183.3

In terms of x, find an expression that represents the area of the shaded region. the outer square has side lengths of (x+5) and the inner square has side lengths of (x-2), as shown. area: a1 x + a2 square units submit