Which of the following equations represents the axis of symmetry for the parabola shown?

a. y = 10x
b. y = x + 10
c. x = 10
d. x = y + 10

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