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Maths Help Needed :(

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Tohru Kyo Sohma:
Ok...so i will soon be starting my university and i have to appear for my placement test!
The test is for Business maths and English
I have tried the maths questions from a sample test paper and am finding it difficult as i haven't practiced maths for a year!
Please help me out with my questions!
 
1. Evaluate (3x^4y^-8/5x^-2y^4z^2)^-2?
2. Find the domain of the function f(x)=2 ?-2+x

Please help me out!

astarmathsandphysics:
Give me an hour

astarmathsandphysics:
Try this. The second question is not clear. You can post again.

Tohru Kyo Sohma:
Thanks astarmathsandphysics
I got how to do the first one
the second one where a question mark appears it is supposed to be a root i copied a symbol but it didn't appear!

astarmathsandphysics:
If  root x then domain is x>=0

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