i was busying duin my hw tis few days...GOSH!!!y should i born in 1993???y should i form 4 nw???!!!n y should i study add math???hate it...whn i was duin those exercise...i hav to refer to the ans bhind the book n sum question i noe the ans...bt i duno how the working is!!!ergh!fine!giv it up!borrow fren's n copy 2ml!hate add math!make me confuse n headache...TT