Matlab and Numerical Methods, please help! thank u in advance

Which of the following stabements are true? The number of significant digits in the number 4910100 is 5 . Underfiow occurs when the absolute value of the number we wish to store is SMALLER than the smallest number that can be stored in a given ticating-but formit. The value of 1024+38261024 is zero in MATLAB because of floating.point overflow. To define 0.4 as a single-precision number in MATL.AB, we use the command single (0.4), or else 0.4 is by default saved as a double-procision number. The floating-point format is preferred over the foxed-point format because it allows us to store both very small and very large scientef nambers. The value of machine precision is determined by the number of bits available to store the fractional part of the number