book Maths Puzzle Numerical Ability

find the domain and range of the function
f(x)= xsquared-x

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book Other Question

I have a set of data for which I want to know the formula for calculating other points on the curve. How do I set this up. Here is the data:
Pressure Loss Through a Water Meter: please help me with this...

0.9x + 2.3x = -6.4

will you show me how you did it?