All Answers

+118735

anony:
5(x+2)/7-x = 4(3-2x)/5-2

Hi Anony,
And thank you for your lovely manners. People answering questions always appriciate that.

Hi Alexandra,
Thank you for helping. I am serious, I really appreciate it.
I am not sure where you went wrong. If you can't find your error I will take a look for you.

This is the answer if you do it my way. Perhaps this is not the question that you had in mind but it is the one you asked for.
I also got the answer from the site calculator just to double check that my answer is correct. and it is.

140305 equation with fraction.JPG

[input]5(x+2)/7-x = 4(3-2x)/5-2[/input]

MelodyMar 5, 2014

+118735

mukolloj:
20squar= 3.773squar/3.773squar+(20-1)

3.773squar/3.773squar+(20-1) = 1 + 19 = 20

So yes 20 does =20 but you would need squar on the end like this

20squar= [3.773squar/3.773squar+(20-1) ] squar

MelodyMar 5, 2014

Thanks

GuestMar 5, 2014

Do PEMDAS.
(P)arenthesis, (E)xponents, (M)ultiplication, (D)ivision, (A)ddition, (S)ubtraction.

Parenthesis:
5(x+2)/7-x = 4(3-2x)/5-2

No exponents.

Multiplication:
5x+10/7-x = 12- 8x/5-2

Division:
5x+ 10/7-x = 12 - 8/5x -2

Addition:
5x + 10/7 -x = 10 - 8/5x

No Subtraction. Now combine Like terms.

5x- 8/5x - x = 10 - 10/7

12/5x = 60/7

x = 5/12 * 60/7
x = 25/7

GuestMar 5, 2014

50/35(-35x)/35=14/35-70x/35
Implies: (35x)+(-70x)/35 =(-35/35)=(-x)
Then: (-14)/35+50/35=36/35
Therefore: Solution is x=-36/35 ???

Is my solution correct?

Thank you!

GuestMar 5, 2014

+118735

BEKERB:
put your money come back the next day and your money has doubled leave that amount in the bank and each day it will double john put 1.00$ in and left it there for 10 days how much was in the bank after 10 days

1 day = $2
2 days = $4 =2 ²
3 days = $8 = 2 ³

10 Days = 2 ¹⁰ dollars = $1024

MelodyMar 5, 2014

+118735

anony:
5(x+2)/7-x = 4(3-2x)/5-2

First check that both sides are independantly simplified. You want the denominators to be as small as possible. Then

The easiest way to start a question like this is to multiply everything on both sides by the lowest common denominator.
In this case the LCD is 35.

Once you have done that there will be no fractions so it should be easy.

Have a go at it and get back if you have problems.

MelodyMar 5, 2014

#19

+118735

+11

reinout-g:
Since I do not have time for a new puzzle, I'll post something which people can comment on.

Steve flips a coin,
If tail appears in the first flip, you receive $2, if tail appears in the second flip, you receive $4, if tail appears in the third flip, you receive $8, if tail appears in the fourth flip, you receive $16, etc. The money will keep on doubling until you hit a tail.

How much would you be willing to pay to play this game?

There is no talk of losing any money here. Does it cost something to play? If it doesn't cost anything and the coin is 'fair' (I can't think of the proper word) Then I would play until i got too too bored, or until I won enough money for that trip to The Netherlands that i have always desired. .
I didn't read it properly - what a shame.

If I played $1 each game, eventually I would have to win.
If I paid $2 per flip then I would break even if tails came up on the first toss and win otherwise. So long as i keep putting my money down.
If i paid $4 per flip then I would only lose money if tails came up on the 1st toss, I would break even if tails came second and after that I would win.
So, it doesn't matter how much I pay (assuming each toss costs the same). so long as I get the chance to play again after each win, I cannot lose (eventually)
NOW you can tell me that I misinterpreted the question again (I always have a problem following the dots) ?

MelodyMar 5, 2014

Mar 4, 2014

#18

+2355

+11

Since I do not have time for a new puzzle, I'll post something which people can comment on.

Steve flips a coin,
If tail appears in the first flip, you receive $2, if tail appears in the second flip, you receive $4, if tail appears in the third flip, you receive $8, if tail appears in the fourth flip, you receive $16, etc. The money will keep on doubling until you hit a tail.

How much would you be willing to pay to play this game?

reinout-gMar 4, 2014

+118735

Yes please. I want to know too.
Melody.

MelodyMar 4, 2014

+2355

bump

reinout-gMar 4, 2014

+2355

Statman74:
Interest=Principle x rate x time

Here is some more help on interest

http://www.mathsisfun.com/money/interest.html

reinout-gMar 4, 2014

+2355

Monkey spanker:
4.65

http://www.mathsisfun.com/fractions_addition.html

This might give you some more information on how monkey spanker came to his answer

reinout-gMar 4, 2014

+2355

nate:
13 × 1\2

6 and a half.

This will give you more information http://www.mathsisfun.com/fractions.html

reinout-gMar 4, 2014

+2355

mathcalc:
Kenneth has $5. He spends g cents everyday. How much money does he have left after one week?

a. Express your answer in cents.
b. Express your answer in dollars.

Note that 1 cent is $ 0.01

Then $5 = 500 cents,

Given that a week has 7 days the answer is

500 cents - 7*g cents (where * stands for times or multiplied by) after one week

or similarly $5 - 0.01 * g * 7 after one week

reinout-gMar 4, 2014

+2355

anabelle1:
Okay guys ! I need your help again.

So, on my homework it says:

Identify the Vertex and tell if it's Max or Min.
And there are some graphs.

My question is: How do you identify ? like how do you know whether it is max or min.

In this case, max stands for maximum and min stands for minimum,
A maximum is the highest value in your graph, or simply said the most upper point,
The minimum is the lowest value in your graph, or simply said the lowest point in your graph

Hope this helps
Reinout

reinout-gMar 4, 2014

+2355

scrutinizer:
The domain of definition: 5x - 3 > 0 => x > 5/3. log5(7x - 4) = log5(5x - 3) <=> 7x - 4 = 5x - 3. The further steps are traditional.

I think you might haver made a small typo scruntinizer because 5x-3 > 0 => x > 3/5

reinout-gMar 4, 2014

+2355

sophia:
how do you round numbers to the correct two decimal places

two decimal places means two digits behind the dot (for example 2.34)
If we want to round of the number 3.4652943 then we examine the third digit behind the dot (which in this case is a 5)
If the number is a 5,6,7,8 or 9 we add 1 to the second digit behind the dot.
if the number is 0,1,2,3 or 4 we leave the second digit as it.
So 3.4652943 would become 3.47 and 3.4642943 would become 3.46

hope that helps
Reinout

reinout-gMar 4, 2014

+2355

Ddeee:
Id like to know how to use the grey 'exponents that are on the upeer right side

I'm sorry to say that I do not understand your question.

Could you please rephrase it for me?

reinout-gMar 4, 2014

+2355

Nickle Pickls:
No he hates you

and by You he means that asian guy named You

reinout-gMar 4, 2014

+2355

Alan:
reinout-g:
ayubbadman:
x2+2xy+y2

Your notation might lead to some misinterpretation but I think what you mean is x^2 + 2xy + y^2 which means x ² + 2xy + y ²

//You can get this second one by using the [sup']2[/sup'] command without the '

We can factorize this to (x ²+y ²)

Factoring is something which is not easy to explain, but maybe this website will help you.

http://www.purplemath.com/modules/factquad.htm

I think you made a slight typo here reinout. You probably meant: We can factorize this to (x+y) ²