book Maths Puzzle Numerical Ability

What is the abosolute value of 12 - 5i?

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book Other Question

State the solution set using interval notation and graph the solution set.
2v^2+7v<4

and
x^2+x>0 AN ARCHITECT IS DESIGNING A NEW LAKEFRONT COTTAGE. HE MUST CONSIDER THE BUILDING CODES IN THE DESIGN. THE RECTANGULAR LOT ON WHICH THE COTTAGE WILL BE BUILT IS 220 FT LONG AND HA