Melody

Thanks anon tht is a good answer except you need a negative sign.

a pos times by a neg = a neg

-22

Or the acos function on the site calc on the home page.

This is latex notation Gino it means

$$-3\le x < 7$$

To get this I just opened up the LaTex formula tab and pasted it in. :)

(the back slash means it is a function, the le means less than or equal to )

The answer is 

[-3,7)

The square bracket meants that the -3 is included and the round bracket means that the 7 is not included.

993 is divisable by 3    

inverse trig is the same as arc trig

Therfore use atan, asin and acos     

You have to hit [2nd] first.

or

if you just hit sine and linger there for a bit longert than usual, it will turn into asin   

Sorry naynay but this doesn't make sense

If you mean

c+d=56 then there is an infinite number of paired answers.

eg.

c=3 and d=53

or

c=12 and d=44

Sun 26/10/14

1) Vectors.   Thanks Alan

Yes thanks Alan.  Now it is very clear.  

@@ End of Day Wrap       Sat 25/10/14    Sydney, Australia        Time 1:10am   (Really Sunday morning)      ♬

Good Evening all,  

Great answers today from Heureka, Geno3141, Rosala, LancelotLink and Chimp Ayumu, Kitty<3, CPhill and Alan.  Thank you.  

I just pulled out a couple of interest posts and here they are:    

1) Calculus - rates - I like these but I got really frustrated because there are only 100cm in a metre.  Doh!  

Thanks Chimp Ayumu, LancelotLink, Chris and Alan (and even I eventually got it right)