$3\mathrm{.}3$ Convert the following decimal numbers into binary, octal, and hex:

a$.{21}_{10}$

b$.{630}_{10}$

c$.{427}_{10}$

$3\mathrm{.}4$ Convert ${27\mathrm{.}156}_{10}$ into a binary number with the fractional binary part expressed in

$6$ bits. What actual decimal does this binary fraction equal?

$3$ and $4$ please