I'm having problems solving for questions 14. I have completed all other algebra questions.
This is a correspondence course, and unfortunately they have very few examples to follow.
Help is greatly appreciated.
What methods of approximation have you come across? Knowing that $\displaystyle 4^3=64$ and $\displaystyle 5^3=125$ should start you off.
Then, you are expected to use the following laws of indices:
$\displaystyle x^ax^b=x^{a+b}$
$\displaystyle \frac{x^a}{x^b}=x^{a-b}$
$\displaystyle (x^a)^b=x^{ab}$
Try applying these and see how you go. Post your attempt if you require further assistance.
Edit: Typo correction.
are you saying you cannot multiply 3 times 6 or 1/3 times 6 ?
you need to review an exponent lesson ...
http://www.purplemath.com/modules/exponent.htm
You have been presented with the steps and theory required already. If you lack the ability to comprehend the theory, then you either need some sort of revision session online, or you need to consult a teacher. It seems to me as though you actually want someone to solve the problems for you - I hope the work isn't going to be graded.
Edit: Corrected a typo.