Morning all,

Not entirely sure which forum was best to post in, so figured i'd just put it in here. Apologies if it sin the wrong place.

Morning all,

So I just got an assignment back, and only went wrong on two questions woo! lol..

But, without having the actual paper back can't see where, so was wondering if someone can explain their answers to the two following questions, and hopefully means I wont make the same mistakes in the future

1) Evaluate the following expressions using indices

and without using the calculator, showing all steps:

(16x^8 y^12)^1/4 (3xy^3)

2) From a rectangular sheet of metal measuring120 mm by75 mm equal squares of sidex are cut from each of the corners. The remaining flaps are then folded upwards to form an open box. Show that the volume of the box is given by:

V = 9000x– 390x2 + 4x3

Find the value ofxsuch that the volume is a maximum:

thanks in advance for any help you can provide