All Answers 352629 Answers

How about (44 - 4)/4?

.

How about adding the two numbers to get the original number of bikes? I guess so becoz they sold 43 and were left with 56 so if we add the two then we get x.😊😎

Your welcome melody! Btw is that really a smile?😉

Thank you all for making me smile.  ☺

3y(2y-3x)

that's the answer

$${\mathtt{9}}{\mathtt{\,\small\textbf+\,}}{\mathtt{10}} = {\mathtt{20}} = \tiny\text{Error: }$$

Calculate the grams of oxygen 10.15g -4.43g P = 5.72g of O

Calculate the moles of phosphorus in 4.43 grams of P

0.14304 moles of P

Calculate the moles of oxygen in 5.72 grams of O

0.3575 moles of O

Divide molar masses to find the ratio

 0.3575 / 0.14304 = 2.5 Phosphorus to 1 Oxygen 

Multiply by 2 for integer values

P₅O₂

This is Phosphorus pentoxide

_7UP_

You know.....that's why I like CPhill so much! 😉😃

What is its empirical formula for 18.6g C, 3.1g H, and 55.02g Cl?

0.24% C 0.04% H 72% Cl  of  76.72g total

Convert to moles and find molar ratios

18.6/12.01 =1.55 mol C

3.1/1.00 = 3.10 mol H

55.02/35.45 = 1.55 mol Chlorine

The carbon and chlorine have the same number atoms and hydrogen will have very near twice as many

Playing with it gives These

CClH₂ 

C₂Cl₂H₄    <---- dichloroethane (This is very common)

These are closer to the ratios

C₃Cl₃H₆

C₃₁Cl₃₁H₆₁

C₆₇Cl₆₇H₁₃₂

_7UP_

Thanks Chris,

I used GeoGebra :)

You can do a lot of things with GeoGebra but it is not very intuitive so I am still learning.

Like with most things, the more you know the easier it is to learn more. :)

Nice use of number line graphics there, Melody...!!!!

What progam did you create that with???

18+(-22)+4+(-9)

= 18+ - 22 +4 + - 9

now if the  + or - signs are SO CLOSE together that you can put a circle around them without anything else in the circle then   

If the signs are the same replace them with a +

If the signs are different replace them with a    -

So the question becomes

18-22+4-9

Start at 18 on the number line.

Go 22 in the neg direction that will get you to -4

Now go 4 in the pos direction and that will get you to 0

then go 9 in the neg direction and that will get you to -9

@@ End of Day Wrap     Sat 10 /1/15     Sydney, Australia       Time 4:30pm       ♪ ♫

Hi everyone,

Today our great answerers  were Tetration, CPhill, Heureka, geno3141, happy7, Shaniab29544 Alan and Rosala.     Thanks everyone.

I think there are some chemistry and physics questions left to answer - if anyone wants to have a go.   

Interest posts:

1) Limit.         Melody

What about it?  It can't be simplified.  

Sun 11/01/14

1) Prove $${\sqrt{{\mathtt{10}}}}$$   is irrational.           Melody

I haven't looked at that one, yet...!!!

I like it - it is good to play with these presentation tools.

Did you have a play with the 'table' tool above?  

It is a pity that there are no borders to go with it but it is still handy and easy to use.  :)

I'd have been happier if there had actually been a logical question to solve....but, as is, it is an impressive  piece of "art"......LOL!!!

Ok i htink I have worked it out.  Thanks Tetration - I will give you the credit :)

2/\..=0.5

means

2^? = 0.5

$$2^? = \frac{1}{2}$$

and yes the answer is   -1

WOW Chris I am impressed with your pic :))

Beats me, what parent function?

That is a problem for Mr. Google my friend    LOL

I cannot see you piture but the simple interest formula is 

I=Prt

I is the interest earned

P is your principal which is the amount that you invested in the first place.

r is your interest rate  if it is 5% then r=0.05

and t is time         If interest rate is yearly then time is also yearly.

Every perfect number found, so far, is even.....the better question is....."Are there any odd perfect numbers??".....it is speculated that there aren't.......but it hasn't been proved ...!!!

[ BTW...for those that don't know...a perfect number is one that equals the sum its proper divisors...6 is the first one and 28 is the next ]

Not many people on here know about chemistry.   :(

There is a couple - you might get some answers.