helo with university maths module

hi im new hear im gong an ICT degree and i have got to do a maths module and i have an assignment i have done well to get 2 questions done my self but i need some help with the rest to understand it and to apply my skills to finnish it off

IM NOT LOOKIN FOR PEPOLE TO DO THE WORK IF SOME ONE COULD EXPLAN AND SHOW ME HOW TO GET TO THE RIGHT ANSWER I WOULD BE VERY VERY HAPPY

2. (a) Explain the meaning of the fractional powers and . You may like to use a numeric example to help you.

3. (a) By weight, a clothing fabric consists of polyester, cotton and nylon . Without converting these fractions to decimals, determine how much of each material there is in

650 grams of the fabric?

(c) Since the credit crunch many financial institutions have reduced the amount they are prepared to lend to people for a mortgage. Imagine that your local bank would previously allow you to borrow 3 times your salary, whereas it will now only lend you 2 times your salary. Using improper factions to help you solve the problem and on the basis that your salary is £18,000, determine how much less your bank is now prepared to offer you for a mortgage.

(8 marks)

4. One measure of fitness is the fitness index, given by

where w is a person’s weight in kilograms and h is the person’s height in metres.

For healthy people F is less than 25, for those tending towards being overweight F is between 25 and 30 inclusive, and F is greater than 30 if a person is overweight.

(a) Which of the above categories would represent a man who is 1.7m tall and weighs 95 kgs.

(b) Rearrange the formula to make h the subject.

(c) Knowing that Amelia weights 65 kg and that she is classed as healthy, what can you say about her height?

any help will be grate