What is the perimeter of the sides of a quadrilateral with sides measuring

5x2 - 6x + 4; 4x3 + 2x2; 2x3 - 3x2 + 4x - 7; 5x - 4

a 10x^6 + 3x - 7
b 6x^3 + 4x^2 + 3x - 7
c 16x^7 - 3x^5 + 8x - 7
d 6x^3 + 10x^2 + 15x + 15