Please Help On This Assignment !

Please help my friend with these questions on Computer Science
I would appreciation even one number is solved.
Thanks and regards.


1.   Jacquard and Babage used punchedcards before Hollerith in their machines. Why is Hollerith’s punchedcard system so significant as to warrant a separate study?
2.   
3.   A list and enumerate the eight basic steps involved in computer programming.
a.   List five activities and processes of a typical data preparation.
b.   List your choice of data processing media.

3.   a.   What kind of file organization do you think would be appropriate for each of the applications below why? i. Payroll  ii.  Personnel   iii.  Inventory iv.  Cash point at supermarket.
   b.   What is the purpose of backing up a file?
   c.   Discuss five threats to security and suggest ways to ensure data security.

4.   a.   Convert the following hexadecimal numbers to Octal, i.  BAD ii.  CAFÉ
   b.   Express the binary numbers 101001010011 in (….)(….)(…, )