exam Maths Puzzle Numerical Ability

Find the reciprocal of (-1/5) (15). This is my last question. Reciprocal?? How do I figure that out i have no clue.

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exam Other Question

Please help me with the following problems. Thank you very much!!!
1)Write a pieces wise function for f(x)=24x-3 (absolute value)
2)Sketch a graph of f(x)= 15x+5, x <1 and 2x-8, I am stuck on correct answer for:

sqare root of 0.64 =

I am not using a specific book. I am just practicing...