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Guest:
So girls will get 120 & boys 100. Is it correct ?

Excellent work JyotiG

NOW will you sign up please ?
I did ask nicely.
Pretty please...

MelodyFeb 19, 2014

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thank you for trying to explain this using algebra. I'm trying to understand algebra . Also, my teacher gave me hint in school that i can solve this using bar model.

GuestFeb 19, 2014

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mitch:
P=500
r= 6%
t= 40 years

You haven't said how often it is compounding. If it is just once a year AND the interest rate is per annum then

S = P(1+r) ⁿ

S = 500*1.06 ⁴⁰

MelodyFeb 19, 2014

+118725

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mitch:
solve 500e(2.4)

MelodyFeb 19, 2014

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lcn1358:
how do you work the problem 2 times the square root of (7x+4)-1=9

More brackets would have been nice because I am not sure what the question is. I will answer 1 possibility.

[2*sqrt (7x+4)] -2 = 9

2*sqrt (7x+4) = 11

sqrt (7x+4) = 5.5

7x+4 = 5.5 ²

7x+4 = 30.25

etc.

MelodyFeb 19, 2014

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bobo:
2+2

GuestFeb 19, 2014

+118725

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KING:
12-3[(5+3)^3-(3^3+1)]

MelodyFeb 19, 2014

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sorry but i have not learned algebra yet.

GuestFeb 19, 2014

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Guest:
f(x)=x^4-9x^3+12x^2+80x-192

Where is the question? Do you want me to factorise it?
The answer to that is

f(x) = (x-4) ³(x+3)

so the roots of the graph will be, a triple root at x=4 and another root at x=-3

NOW if you want me to explain any of the this you will need to be more specific.

MelodyFeb 19, 2014

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So girls will get 120 & boys 100. Is it correct ?

GuestFeb 19, 2014

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piestanderd wrote: if 3v+2 = 7v-6 what is v?
Ok, 3v+2=7v-6
puting like terms on oneside gives
=> 2+6=7v-3v
=> 8=4v
making v the subject we divide both sides by 4
=> (8/4)=(4v/4)
=> 2=v
v=2

Princess Sophie EFeb 19, 2014

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Guest:
8g+9h-4g-5h

the minus sign belongs to the letter behind.
so this can be written as

8g-4g +9h-5h

that is 8 goats - 4 goats + 9 hats - 5 hats.

You tell me, what is the answer ?

MelodyFeb 19, 2014

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niranjan:
Ask a Math Question!
(1993)^1993/13

140219 big number1.JPG

There you go. Can I please have a thank you?

MelodyFeb 19, 2014

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Woody3:
What is (-6) to the 19 exponent

If the question is -6 ¹⁹ then this really means -1*(6 ¹⁹ ) = - 6.08 x 10 ¹⁴ correct to 3 significant figures

But if you mean (-6) ¹⁹ then you need to think a little harder.

(-6) ¹ =-6

(-6) ² =36

(-6) ³ =-216

so if the power is odd the answer is negative if the power is even the answer is postitive so

(-6) ¹⁹ = - 6.08 x 10 ¹⁴ correct to 3 significant figures

MelodyFeb 19, 2014

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The_singing_sumo:
You must type the number!!!!!

That is not very polite. There is not enough room on the page to type the number. It is 1 followed by more zeros than you can imagine !!!

MelodyFeb 19, 2014

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jyotig:
At the fair, 220 balloons are given to 40 children, 3/8 of whom are girls. Each boy receives the same number of balloons. Each girl receives twice as many balloons as each boy. How many more balloons do all the girls receive than all the boys?
Changes have been made in red.
Need MEthod, No Algebra!

40 children
3/8 of 40 = 15 girls therefore 25 boys

boys get some multiple of 25 balloons, girls get the same multiple of 30 balloons.
so
Some number times(30+25) = 220 balloons
Some number times 55 = 220 balloons
4 * 55 = 220
so the number is 4
The boys get 25*4 = 100 balloons
the girls get 30*4 = 120 balloons

You tell me, how many more balloons do the girls get.

Maybe you could have done this one yourself ? It was much easiler than the other ones.

MelodyFeb 19, 2014

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You must type the number!!!!!

GuestFeb 19, 2014

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YOU ARE A BIG DUMB BUMD

GuestFeb 19, 2014

+6252

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really really big

RomFeb 19, 2014

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Quote:
if you got 8 decks of cards, you take 5 cards. waht is the possibility of atleast one ace of spades?

I assume you pick 5 cards w/o replacing them

at first pick odds of not picking an ace of spades is

51/52

2nd pick the chances are (8*51 - 1) / (8*52 - 1), i.e. # of non ace of spade cards left / # cards left

3rd pick the chances are (8*51 - 2)/ (8*52 - 2)

etc. up to 5

you get

{51/52, 407/415, 203/207, 405/413, 101/103}

multiply all these together to get your final probability for picking 5 non ace of spade cards

p = 547175277 / 603251636 ~ 0.91

now the probability of picking at least 1 ace of spades is (1 - p) ~ 0.09

RomFeb 19, 2014

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Quote:
(-343x^-12)^1/3

[size=150]([/size](-343)x ^(-12)[size=150])[/size] ^(1/3) =

(-343) ^(1/3)x ^(-12/3) =

-7x ^(-1/4) =

-(7 / x ⁴)

RomFeb 19, 2014

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Quote:
log9 729=x x=

log ₉(729) = x ==>

9 ^x = 729

you can quickly note that 9 ³ = 729

and thus x = 3

RomFeb 19, 2014

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Quote:
Emily and Sarah had a total of $80. After Sarah spent 1/3 of her money and Emily spent $17, Emily had twice as much money as Sarah. How much more money did Emily have than Sarah at first?

asking to solve this w/o algebra is like asking to make an omelet w/o eggs.

This is an algebra problem.

RomFeb 19, 2014

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Quote:
-(8/343)^-(4/3)

Not quite. You forgot the 4th power.

-(8/343) ^(-4/3) =

-(343/8) ^(4/3) =

-((343/8) ^1/3) ⁴ =

-(7/2) ⁴ = -2401/16

RomFeb 19, 2014

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Quote:
What is -10.6666666666666667 in a fraction?

what you're really interested in is what does 0.6666666666666666666 etc. convert to

the trick to this (and it is a trick) is to consider the difference between itself and 10 times itself i.e.

6.666666666666666... - 0.6666666666666666... = 6

so let x = 0.666666666666666666...

10x - x = 6

9x = 6

x = 6/9 = 2/3

suppose you had 0.12121212121212.......

you can consider the difference of 100 times itself and itself

you get

99x = 12

x = 12/99 = 4/33

similarly with repeating patterns of length K, just consider the difference of 10 ^K times itself and itself.

RomFeb 19, 2014

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