1. Computers represent numbers in floating-point arithmetic, i.e. x = mẞe, where ẞ is the base, e is the exponent and m is the mantissa truncated to a finite number of digits as m±do.d₁d2d3...dt. a) use these facts to explain overflow and underflow, b) explain how the smallest representable difference between two numbers varies with the absolute magnitude of their average.