Melody

9x+3y=0   (1)

-36x-12y=0 (2)  this is the same as 9x+3y=0   (2b)     I divided both sides by -4

Now I can see that equation (2b) is the same as equation (1)

this means that there is an infinite number of solutions because they are exactly the same equation.

If you graphed them - they are the same line. 

Hi Shaniab,     

No, if the poster of the question still needs/want an answer, they need to let us know.

(Or if you personally are also very interested in the answer then you can let us know)

Many times if the question has been here a long time it no longer needs an answer because the asker has found the answer somewhere else.   

Make sure the toggle button on the bottom left is set to degrees then type in

atan(164/1356) and press enter.  that should do it.  :)

arctan is the same as inverse tan  :)

enter it just like that on the home page calc   

arc sine is the same as inverse sine.

so on this calc it is    [2nd] [asin]

I do not know what you mean  

This is the same as    37 x 1.739

and there is a calc on the home page.    

It is a very little number so the indice will be negative.

You want just one digit in front of the point so the number part will be    3.456

So you have to JUMP the point over 000 and 3.   That is 4 jumps.  You can actually put the loops in on paper.

So the answer is

$$3.456\times 10^{-4}$$                      

TRY WATCHING THIS CLIP

First thing to do is to draw it.

The path and pool together have an radius of 6m

so together the area is 

$$A=\pi*6^2$$

But for the pool by itself the radius is 5 metres

so the area of just the pool is

$$A=\pi*5^2$$

The area of just the path must be the entire area minus the area of the pool.   

You can finish it.