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yes we both did a good job!i was just joking with you!

i am sorry but this question does not make any sense!

we cant just calculate the width like that , u need to give us a proper question to find out the width of something!

Rosala, you did a good job too.  We all learn of each other.   

i believe its 547.4 but check

yeah nice explaination melody!

but............i think.......that has to be easy for a teacher isnt it and im a student!

woooow nice explanation!! i got it thanks melody

Thanks Rosala

In this instance -9 is thought of as -1*9 and so it is reasonable that -1*9^2 = -1*81= -81

This is because you do exponents before you do multiplication with order of operation.  ;)

There are a lot of maths conventions like this.  someone had to say how this wuld be interpreted and this is what was chosen.

This example might make more sense to you,

20-3^2 = 20-9 = 11

see, it is 20-(3^2) =11    not     20+(-3)^2 which would be 29

yeah but isint -9^2 the same thing as -9 x -9 which equals 81? o.O

-9^2 is -81 and not just 81 becoz there is a minus sign in nine which we will also include while we solve the square so thats why just becoz nine has a minus sign , the sign is also included in our answer after we solve the square and if nine didnt have a minus sign so it means there is nothing for us to include in our answer thats why 9^2 is 81 

hope u have understood by now but if not then pls be free to ask!

hope this helps!

why does sec(-45) and csc(-315) both come out to square root of 2???

-45 degrees is in the 4th quadrant.

sec=1/cos

cos is positive in the 4th quadrant so sec is pos too.

Cos45 = 1/sqrt2

so sec45=sqrt2

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

-315 degrees is in the first quadrant 360-315=45degrees

all the ratios are pos in the 1st quad so cosec is positive too.

cosec 45 = 1/sin45

sin 45=1/sqrt2

so

cosec45=sqrt2

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

I hope that helps but if it doesn't just add another post on to this one.

I'm off to bed very shortly but someone else will answer you.  

I am nort sure what you mean but if you leave our one set of brackets it works fine.

$$e^{(666/67)*(7776*77)*7*0+c}\\\\
=e^{(666/67)*(7776*77)*7*0}*e^{c}\\\\
=e^0*e^{c}\\\\
=e^{c}\\\\$$

NOTE:   $$e^0=1$$

Is that what you wanted?

Welcome!

I meant rewritten as e^0*e^c.

What about if it is on top of a division with e in it and if numerator is 1+ all of e^....+c as i wrote and denomenator is 1- some similar form. Ignore values. Just brackets and method.

thanks rosala. 

Yes it is very helpful!Thanks for it!i would give u points for you both explaining answers!

Yes Rosala that is excellent.  

My method that I described is good fo all sorts of questions.  You should think about it and make good use of it.  

Oh sorry MElody i hadnt read  your answer with much concentration!ive got the answer!

Let the no. of students be = x

let the amount paid by each student be = x

x * x = x^2  = 2401

√2401

(after taking the LCM of 2401) √2401=√ 7*7*7*7

√2401 = 7*7

√2401= 49^2     ANSWER

Therefore , there are 49 students in the class who paid Rs49 each!

Am i correct Melody!

I just checked thats how my teacher has made us do!but i didnt copy from that!i used my own brain!

Okay for my easy example you would have

$$5^2=25$$

For your harder question you would have 

$$N^2=2401$$

There are N children in the class.  Each child gives N repees.  That is a total of N*N rupees.

But you are told that 2401 rupees are saved up.

so  $$N*N=2401$$

Does that make more sense Rosala?

This might be cheating just a little bit. i am not sure  They are called grouping symbols  

$$\\(149+39+22)/(11-9+3)=2+2(+3^2-4+3\times 5)\\\\\\
210/5=2+2(9-4+15)\\
42=2+2(20)\\
42=42$$

Melody can u just give me a hint of how to start the answer!just how to do the starting then i'll try more myself!

The question does not make sense.  sorry.

Hi Rosala,

When ever you get a difficult question you try to think of a similar style question that is much easier.

If you can do the easy one then you can use the same method and get the answer to the hard one.

Say there are 5 children in the class.  Then each child would donate 5 rupees.  

That would be a total of 5+5+5+5+5=25 rupees  OR 5^2 rupees.

NOW in your class you do not know how many students there are so just let there be N students.

Can you set up the equation and solve it now Rosala.

If you can't I will do more but it would be really good if you could finish it on your own. 

I will assume that every table has the same number of baskets.

there are B baskets on a table

Each basket has B+4 strawberries in it.

So on one table there must be B*(B+4) strawberries.

There are five tables so there must be 5B(B+4) strawberries.

$$\frac{4}{9}+\frac{7}{9}=\frac{11}{9}=1\frac{2}{9}$$

Oh Well!Oh Well!

I think this time CPhill wont win!!And Aziz if he had won this time then he would have been the richest person OUT OF THE WORLD!

But DS what if i win then i can get thew crown and be the Queen!Couldnt i?

Ok so your riddle is so easy and the answer to this is An X-Ray!

What do you call a X that lives in the ocean?

Answer:An X-Ray

so am i not the winner!!