The base of an open rectangular box is of length (2x + 5) cm and width x cm.
The area of this base is 58 cm².
The height of the open box is (x - 2) cm.

I have attached a pic
(I already did part (a) and (bi) and you may use the answers to help you do the (bii) question)

+ the answer for (bi) if you can’t see it, it is 4.28 and -6.78

This is the question:
b) (ii) Hence calculate the volume of the box, stating the units of your answer.