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looks like i won't be getting any friends. oh well..

lol /\, me too! Every single friend i have is going to unsw, and i'm trapped in usyd. oh well....

@abcd, they don't come from a textbook. @soul, thanks!

completely lost.. The thing that screws me most is the fact that it doesn't start from time=0 , but 30 minutes after t=0. =/ Any help is greatly appreciated.

need help with this question... i think i might have the solution, although not quite sure, what i've done is: 1st digit - 2! ways 2nd digit - 10! ways ... .. .. 8th digit - 10! ways therefore 2! + 7(10!) is that right?

thanks very much for your help Iruka!

ok solved. If you look at my working out, case 3 is a contradiction, since if x = -7/2, for that case -7/2 cannot be greater than 2 therefore, no solution for case 3. case 2 and case 1 work out therefore solution is [-7/2 , -3/4] - interval notation

lol it works! yay! lol, i'm still wondering if the correct answer is -7/2 =< x =< -3/4 or [ - infinity , -7/2] - interval notation ie.. negative infinity =< x =< -7/2

if you look at my crude equational graph, you should find out how i get all 3 cases. and whether i made a mistake or not.

well since the question has a greater than or EQUALS sign, shouldn't your answer be: -7/2 =< x =< -3/4 ??

lol, 1.place sketch on paper in scanner. 2. turn on scanner 3. Run scanning software (mines called "EPSON Scan" 4. Click on "Scan" 5. Upload your image on imageshack "www.imageshack.us" 6. post a link to your image here

lol, thats alright, i should be thanking you for your efforts already =P ok, so the answer is: -7/2 =< x =< -3/4 ?

ok thanks!

through my method, i also found those 2, so the answer is [-7/2 , -3/4] ie. -3/4 >= x and -7/2 >= x ??

ok, thanx i see how to do q3 now. q2 is still giving me the creeps =(

lol, does that even involve substitution?

so the points of intersection are at x= -5/3 and x=2 lol i'm lost now...

but theres only one point of intersection... ===== for q3. i end up with: (e^x+3)(e^x-9) am i right?

Need help with question 2 and 3, i can't seem to finish it. Heres what i've done so far for question 2: i can only get one case to prove true, the other 2 seem dodgy... and question 3: am i going in the right direction?

thanks dudes, i'll be sure to keep that factorial rule in mind, it will come in handy.