exam Maths Puzzle Numerical Ability

I am in need of some help
Sqaure root y+9=1
and Simplify Square root 1/5
Thank you

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exam Other Question

Find the next term in the sequence

1/2, -4, 32........ Given (k+2) x^2 + (k-17)+8=0 Determine the value of k so that (a) the sum of the roots is 0, and (b) the product of the roots is -2.