Add the following decimal numbers in biased floating point binary format an leave in$$biased floating point binary format to $3$ digits to the right of the binary point.

addition

$4\mathrm{.}25\_10+-11\mathrm{.}875\_10$

$5\mathrm{.}625\_10+-9\mathrm{.}375\_10$

multiplication$$

$5\mathrm{.}625\_10*-9\mathrm{.}375\_10$

$4\mathrm{.}25\_10*-11\mathrm{.}875\_10$