joy1

1)in mathematics a0 =1 , when a not equal to zero. My question is how ' a multiplies 0 times is equal 1"?????? 2) vector a - vector a= null vector. What would be its direction?Is that a vector? 3) parameter of a circle is equals pi r 2 . why we use pi instead of a constant number 22/7?????

difference between internet and extranet with example?

difference between designview and datasheet view?

difference between select query and cross tab query?

where fixed length and variable length record uses?give an example using file name...