What causes divide underflow, and what can be done about it?

What causes divide underflow, and what can be done about it? Why do we usually store floating-point numbers in normalized form? What is the advantage of using a bias as opposed to adding a sign bit to the exponent? Show how each of the following floating-point values would be stored using IEEE-754 double precision (be sure to indicate the sign bit, the exponent, and the significant fields): a) 12.5 b) –1.5 c) 0.75 d) 26.625

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