Melody

Thurs 14/5/15

If you would like to comment on other site issues please do so on the Lantern Thread.  Thank you.    

Interest Posts:

FTJ means 'For the juniors' 

Yes I forgot about that Alan.   Maybe this is better   

$$\\4=2r^2-2r^2cos120\\
4=2r^2-2r^2*-0.5\\
4=2r^2+r^2\\
4=3r^2\\
\frac{4}{3}=r^2\\
r=\frac{2}{\sqrt3}\\\\
y= \frac{3r\sqrt3}{2\sqrt{8-\sqrt{37}}} \;unit\;thingies\\\\
y= \frac{3*\frac{2}{\sqrt3}\sqrt3}{2\sqrt{8-\sqrt{37}}} \;unit\;thingies\\\\
y= \frac{6}{2\sqrt{8-\sqrt{37}}} \;unit\;thingies\\\\
y= \frac{3}{\sqrt{8-\sqrt{37}}} \;unit\;thingies\\\\\\
x=\frac{r\sqrt{\left(8-\sqrt{37}\right)}}{2}\;\;unit\;thingies\\\\
x=\frac{\frac{2}{\sqrt3}*\sqrt{\left(8-\sqrt{37}\right)}}{2}\;\;unit\;thingies\\\\
x=\frac{\sqrt{3\left(8-\sqrt{37}\right)}}{3}\;\;unit\;thingies$$

Hi MG,

I never use a $ for spaces.

But LaTex does a lot of strange things and it behaves slightly differently in different forums too.  This is because there are many different versions of it around.  It is best to know a lot of methods for doing the same thing because if one method doesn't work another probably will.

I saw that Latex of yours on the forum - it looked great.  

I think it is time for you to start really practicing the array functions.  

That can be extended to do a lot of things but I think that you need some practice with it first. 

How good are you at solving equations?

Can you solve this one and present it in latex using the array function?  

(5x+6)/12=-2

Great job there Chris   

320-20=300 that is how much he borrowed.

34*10=340 that is how much he paid back (the principal) in 9 months.  He paid $40 interest in 3/4 of a year

If it is simple interest then

I=Prt

40=340*r*(3/4)

40=340*0.75*r

r=40/(340*0.75)

$${\frac{{\mathtt{40}}}{\left({\mathtt{340}}{\mathtt{\,\times\,}}{\mathtt{0.75}}\right)}} = {\frac{{\mathtt{8}}}{{\mathtt{51}}}} = {\mathtt{0.156\: \!862\: \!745\: \!098\: \!039\: \!2}}$$       

That is about 15.7%  per annum

Not quite Felicia, That will be the age you turn in 2015 but you might not have had our birthday yet :)

Thanks Felicia

Multiplying by 9

Felicia is right the finger method is excellent !

here is a clip on how to do it

i is an imaginary number - most students NEVER have to worry about it!

You can factor out the 4 and get   4(2a-3b)