All Answers 358514 Answers

there are lots of ways to do it but I wil show you the most formal way. 

$$1 \frac{3}{4} \div \frac{1}{2}\\\\
= \frac{4*1+3}{4} \div \frac{1}{2}\\\\
= \frac{7}{4} \div \frac{1}{2}\\\\
\mbox{When you are dividing by a fraction your have to invert(turn the second one upside down) and multiply}\\\\
= \frac{7}{4} \times \frac{2}{1}\\\\
= \frac{14}{4} \\\\
= 3\frac{2}{4} \\\\
= 3\frac{1}{2} \\\\$$

Wed 13/8/14

Some fun here.  

@@ End of Day Wrap :   Tues 12/8/14      Sydney, Australia     Time 10:05pm   (Really Wed morning)    ♬  

Hi all,

It's aleady getting busier I think.  Our fabulous answers were today provided by NinjaDevo, CPhill, Alan, AzizHusain, TakahiroMaeda, DragonSlayer554, admin, Will85237 and Rosala.  Thanks  

Our King is still deciding upon the 'look' for his (and ours) Kingdom of Camelot.   The score board has changed a couple of times again today.  Nothing is final yet. 

Here are some interest posts for today:

Rosala's Laughs

Look in the LaTex thread.  I'm pretty sure you will find the information that you need in there. 

Sorry - you are already in the LaTex thread.

Try this post.

It wasn't me dragon.

I complemented you on your post.  Why would i then punish you.  That would not make any sense!

I have an idea.  You asked if you could help.  This post is out of date plus i can't edit the early posts because they belong to the old forum and they can't be edited any more.

Would you like to try updating it for us?  You will have to think about how to do this.  Maybe talk to Ninja.  He is doing a really good job with 2 other threads.  He may even help you with the 'look'.  The forum will look more professional if these information threads have a similar look about them.

If you don't want to do this or it becomes too difficult then don't worry about it.  It is just a thought. 

By the way, I know that you greet people with private messages when they join.  I really like this.  Thank you. 

Good Luck dr

Good bye DS!

And Aziz how did u know from which part of California is DragonSlayer from!

i think u got to know becoz of his school!right?but still how did u figure it out!?

Your Welcome!

18 shows growth because as x gets bigger so does y.

26. You will use the compound interest formula     PV=P(1+r)^n

That is a start for you anyway. 

Do you mean that this is an irregular pentagon (5 sides)

And that the distance from some central point to each of the vertices is the lengths given?

No I don't think that is what you mean.  

No I'm sorry i do not know what you mean.

okay thanks Alan.  

I don't think that is quite right Takahiro,

Say something costs $100 and you have to add 10%gst that makes it cost $110.

If you want to go backwards you cannot say 10% of $110=$11 so the pre GST price was 110-11=$99.

You see, it is 10% of the pre taxed price not 10% of the hight price!

--------------------------

I am going to let the original price be $x

It was reduced by 20% so the new price will be 80% of the original price.  That is 0.8x

Now 10% GST is added that means the price will  be 110% of 0.8x = 1.1*0.8x = 0.88x

Nlow 0.88x=$120

x=120/0.88

x=$136.36 to the nearest cent.  

What are all these little pictures that are appearing that I can't see.  They are annoying.

The quantity of time measured in minutes depends on the quantity of speed measured in feet.

The quantity of speed measured in feet depends on the quantity of time measured in minutes.

Speed is not measured in feet!    So it is not either of those 2.  

The quantity of distance measured in feet depends on the quantity of time measured in minutes.

The quantity of time measured in minutes depends on the quantity of distance measured in feet.

Now this is strange wording but the distance the plane travels depends on how many minutes have passed.

Plus speed = distance / time 

So I would go for the 2nd last one. 

That's great...but what's the question? :)

I'm thinking your probably want to find the height of the rectangle.

Here, we need to break this apart into a right triangle and solve and using the Pythagorean Theorem. Here we want to find the height (or a)

This is a tricky one maria,

69 = half of 2 adult tickets + half of 1 child's ticket

69 = 1 adult tickets + half of 1 child's ticket

Let the adults ticket be x dollars

The child ticket is 6 dollars less so that would be x-6

so

$$\\69 = x + \frac{1}{2}(x-6)\\\\
\mbox{multiply both sides by 2}\\\\
138=2x+(x-6)\\
138=2x+x-6\\
138=3x-6\\
144=3x\\
x=48 \qquad \mbox{Price of full adult ticket}\\
Child =48-6=\$42$$

NOTE TO MARIA379

Your questions include pictures that do not display on my computer.  Can you insert whatever these are by hand please?

4x - 3y + 2z - 3x - y + 3z = ?

When you add and subtract with algebra you can think of the pronumerals as things.

You can only add and subtract like terms - this means the 'things' must be the same.

so you can think of this problems as

4 xylophones - 3 yaks + 2 zebras - 3 xylophones - a yaks + 3 zebras

=4 xylophones  - 3 xylophones - 1 yaks - 3 yaks + 3 zebras + 2 zebras

=1 xylophones   - 4 yaks  + 5 zebras 

=1x-4y+5z

=x-4y+5z         (1 xylophone is the same as a xylophone - you don't need the 1 it can be invisable)

Thanks for the laughs Rosala.  

I just did a page of LaTex for this (which I lost) and I am not going to repeat it BUT

Here is a page that I put together on negative indices.  It should help you understand how it works.

Hi Melody.  The n in (2n+1) is just an integer.

For a square root there are two solutions, so n takes on two values, say 0 and 1, and 2n+1 becomes 1 and 3.  

These give two values of -1 when plugged in to e^i(2n+1)pi. The two square roots of -1 are then found by taking the square root of these (e^i(2n+1)pi)^1/2 = e^i(2n+1)pi/2. When n = 0, e^i(2n+1)pi/2= e^ipi/2 = i, and when n = 1, e^i(2n+1)pi/2= e^i3pi/2 = -i.  Hence we have two values (i and -i) for the square root of -1, one for each value of n.

Similarly, we need three values of n (0, 1 and 2) for finding the three cube roots of -1, and four values for the four fourth roots etc.

ok Now i get it!

He left out the y

How many inches. 

He actually needs to make $11.67 PROFIT on each bag.  

So he will need to sell them for the Cost Price + $11.67

Hi Sir Alan,

Please do not be offended but I am amused by what you think is good idea.   

BUT I will still try and work out what you are telling me.    

the first line is good   I am glad i can understand that much.

But, where did the 2n+1 that you have everywhere come from?