imgur: the simple image sharer
I have done the first 2 questionf of 8 but I cannot do the last 2,
I don't know what to do so I haven't attempted anything...
With that in mind you can express
as and solve part c) as you did in parts a) and b)
For part d) you can do something similar, but notice that here we have a cube root.
Try to solve it and let us know if you need more help.