Additional Maths Form 4 2010 Additional Math Help Needed.?

Additional Math Help Needed.? - additional maths form 4 2010

Hello everyone,
I do not understand some problems on my math homework. Can someome please help me. Please show can continue, I expect and to understand ..
Thanks

1. To solve. x 2 / 15 = 6 / 5

2. Multiply. 4x-40 / x ^ 2 +5 x times 4x/10-x

3. Multiply. 10x ^ 2 / 3 times 15 / x ^ 6

4. Simplify. 4 / 18 / 6 / 20

5. To solve. 4 / 9 = 8 / x

6. Write in simplest form. 3x ^ 8/12x ^ 16

7. Resta. Give your answer in its simplest form. 7x/8-x/8

Thanks in advance ..