book Maths Puzzle Numerical Ability

I have been working on this problem for a week and I still can't figure it out. This is what I have so what am I doing wrong?

Let the function f be defined by f(x) = 1/(sqrt1-x^

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book Other Question

yearly average of 35.18% and another of 33.43%, these are my answers but Im not sure how to figure out the number of successful repairs each candidate would make on 50 calls?

pl M^2+N^3-(last digit of M+N)= 2052

M and N= positive integers. Find all possible values of M+N.