exam Maths Puzzle Numerical Ability

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,

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exam Other Question
I need help on page #575 on question #20. I need to solve the roots of each quadratic equation using the factoring method, and place the equation in standard form before factoring:


X^2=10x-24


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