Final answer:
The work done on the box from x = 0m to 12m is 32Nm, which is equivalent to approximately 30J.
Step-by-step explanation:
The work done on the box can be calculated by finding the area under the curve of the force versus distance graph. From x = 0m to x = 12m, the area under the curve can be divided into two parts: the rectangular portion and the triangular portion. The rectangular portion has a height of 4N and a width of 4m, thus its area is 4N * 4m = 16Nm. The triangular portion has a base of 8m and a height of 4N, thus its area is 1/2 * 8m * 4N = 16Nm. Therefore, the total work done on the box is 16Nm + 16Nm = 32Nm, which can be rounded to 30J.