$2.$ Solve. $(2$ marks each$)$

a$)$ A$459$

$+4$CF$6$

b$)8$B$3$

$6$C$4$

$3.$ Convert the following decimal numbers. Show all your steps. $(2$ marks each$)$

a$)156$dec to binary b$)4025$dec to Hexadecimal c$)-247$dec to binay