exam Maths Puzzle Numerical Ability

(x-2x^1/2+1)^1/2 /1 - x+1/sqrtx-1

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exam Other Question

{(1,1),(1,-1),(2, -4), (3,9), (3,-9)is it a function and give the domain and range. My son is back in school, and my algebra from 20+ years ago is not coming back to me...

Please help me with this:

Julie is 4 times older than Aaron. In 10 years Julie will be twice as old as Aaron. How old are Julie and Aaron?