book Maths Puzzle Numerical Ability

A man buys 2 horses. He sells one horse for a 20% profit. He sells the second horse for a -20% profit. What is the difference between his total profit and loss, and how much did he sell each horse for?

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book Other Question

I have another piecewise defined function to graph:
f(x) = {x^2 if |x| <=1}
{1 if |x| >1}

If |x| being less than 1 I should get all positive values on the graph, right?

Thank you very much! Trying to answer this: -X over 2 + 4=12 -x/2+4=12 Can you please explain the work on how to do this