Dena is going to construct a paper box. She will make the box x inches wide. The height of the box is 3 inches greater than the width, and the box is twice as deep as it is high. The volume of the box is 64 in3. Which equation correctly describes the volume of the box?

64=2x3+12x2+18x64 is equal to 2 x cubed plus 12 x squared plus 18 x, , ,

64=18x364 is equal to 18 x cubed, , ,

64=2x3+9x2+964 is equal to 2 x cubed plus 9 x squared plus 9, , ,

64=6x3+18x2