Stu, it would be really good  if you would fix up the numbers in the original question so it makes total sense.  

Could you do that please?

Fahim, why are you putting this personal information on the forum?

I have whited it out because I think it may have been a mistake.   

Fri 26/9/14

1) What does this question mean?  (thanks Quinn - is Quinn correct?)

@@ End of Day Wrap     Thurs 25/9/14     Sydney, Australia    Time 9:20 pm    ♬  

Good evening all,  well it is evening for me anyway.  Good morning for all those west of the Atlantic Ocean.  

Lots of great answers today from Coolkille98, CPhill, Reinout-g, Alan, DragonSlayer554, Landry, Stormegetton, Adrienne, HaleyWoodall17, Quinn, AngelicaMarrufo, Kitty<3 and NinjaDevo.  You are all wonderful, thank you.  

There are a lot of new people every day.  I cannot keep track, sorry.  We are very pleased that you have joined our forum.  I hope that you find the forum useful and enjoyable.  If you are answering questions, thank you very much.  

Here is a few interest posts for the day:

1) Motion diagrams - These always make people think.  (thanks Chris and Alan)

220 what???

-(101/115)^684 ≈ -2.7447*10^-39

You were given the answer Stu.        

"The lot number is L8. You are right, the 68 is missing. Us chimps know how to look at things from many angles. Isn't that right, Alan?"

Being fair to you it would have been easy not to realise.    

I don't understand the diagram, sorry.

The sine of an acute angle in a right angled triangle is the opposite side over the hypotenuse.

The cosine of an acute angle in a right angled triangle is the adjacent side over the hypotenuse.

Maybe this will help.

Some Old Hags            Sine=Opp/Hyp

Can't Always Hide         Cos=Add/hyp

Their Old Age               Tan = Opp/Adj

$$\\\sqrt{75}+\sqrt{12}\\\\
=\sqrt{25*3}+\sqrt{4*3}\\\\
=5\sqrt3+2\sqrt3\\\\
=7\sqrt3$$

√75 = √(25*3) = √5²*√3 = 5√3

√12 = √4*3 = √2²*√3 = 2√3

Therefore √75 + √12 = 5√3 + 2√3 = 7√3

Look at them upside down!

Thanks anon,

Sorry Stu but this is really hilarious. 

You really should feel honoured.  No stranger has EVER paid me this much attention.   I haven't laughed so hard since anon's last post.

ROF LOL          

Hi Alan, elaborate ? I will take this back to the lecturer. Maybe it has been inpropperly writen by the original or secondary source.

Nice pics anonymous, they look like your mum.

√75 = 8.66

√12 = 3.46

8.66+3.46=12.12

It's pretty easy. You just have to take a negative -0.

For example:

20/-0 = 5

50/-0 = 10

you can't

anything divided by 0 is error

Was ist die Hauptstadt der Slovakei : Bratislava 

very hard my friend

si muy bien. Me gusta matematicas y soy muy bien. Pero no tengo una respuesta a su pregunta

$$\small{\text{
$ \frac{10 \sqrt40}{\sqrt5} =10 \sqrt{ \frac {40} {5} }= 10\sqrt{8} = 10 \sqrt{4*2}= 10*2*\sqrt{2} = 20\sqrt{2} = 28.2842712475 $
}}$$

Like so?

A block of metal has a width of 3.2 cm, a length of 17.1 cm, and height of 6.0cm . Its mass is 1.1kg . Calculate the density of the metal.

0.032*171*0.06m^3

$${\mathtt{0.032}}{\mathtt{\,\times\,}}{\mathtt{171}}{\mathtt{\,\times\,}}{\mathtt{0.06}} = {\frac{{\mathtt{1\,026}}}{{\mathtt{3\,125}}}} = {\mathtt{0.328\: \!32}}$$     m^3

density =  $${\frac{{\mathtt{1.1}}}{{\mathtt{0.328\: \!32}}}} = {\frac{{\mathtt{6\,875}}}{{\mathtt{2\,052}}}} = {\mathtt{3.350\: \!389\: \!863\: \!547\: \!758\: \!3}}$$     kg/m^3