$14\mathrm{.}1$ Using the Excel Help menu, discuss how the following functions are used. Create a simple example and demonstrate the proper use of each function.

a$.$ TRUNC$($number$,$ num$\_$digits$)$

b$.$ ROUND$($number$,$ num$\_$digits$)$

c$.$ COMBIN$($number$,$ number$\_$chosen$)$

d$.$ DEGREES$($angle$)$

e$.$ SLOPE$($known$\_$y$\text{'}$s$,$ known$\_$x$\text{'}$s$)$

f$.$ CEILING$($number$,$ significance$)$