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Before the calculator logarithmic tables were used when dealing with the adding subtraction division and multiplication of huge numbers, expressing large numbers as an indice say 10 power of 23, can be expressed as log 10 (huge number) = 23. These tables and log rules made the manipulation of large numbers easy.

GuestOct 4, 2013

+118725

Consider Bob first
Every year that his first $100 is invested he gets a flat $10 interest
Every year that the second deposit of $200 is invested he gets a flat $20 interest (plus the $10 that he is getting for he first $100
So this is how much he will have at then end of each year up to 10years
$110, $120, $130, $140, $150
$350, $380, $410, $440, $470, $500
So after 10 years Bob has $500

Now think about Judy
n must be equal to 1,2,3,4, or 5 because otherwise 2n is more than 10 which is no good.

If n=1 then the first 100 dollars is invested for (10-1) years It will will accumulate to 100*1.08^9
the 200 is invested for (10-2) years. It will will accumulate to 200*1.08^8
Together these add up to $570. Bob only gets $500 so this is too much.

Try n=2 and see if it works.
When you get the correct n, the amount might not be exactly $500 bit it will be close.

MelodyOct 4, 2013

-3.8Y+Y=0.009
-2.8Y=0.009
Y= - 0.009/2.8= -9/2800= -0.003

GuestOct 4, 2013

+118725

How would I do this problem? log(10).1

do you mean (log of 10 base 10) times 1?

10 equals 10 to the power of 1
so
log of 10 base 10 =1

and

1 times 1 = 1

MelodyOct 4, 2013

Well thats difficult but you should learn from yourself! and cmon your smart you don't need some website! are you dumb? noooo or are you? yeaaaa

GuestOct 4, 2013

Melody:
just treat it like a normal equation only remember that you will have to swap the sign around if you
a) multiply by neg number ex -x is greater than 3 becomes x is less than -3
b) swap sides

GuestOct 4, 2013

Oct 3, 2013

+118725

just treat it like a normal equation only remember that you will have to swap the sign around if you
a) multiply by neg number ex -x is greater than 3 becomes x is less than -3
b) swap sides

MelodyOct 3, 2013

+118725

add 0.5x to both sides

then subtract 4.5 from both sides

then divide both sides by the number in front of the x.

MelodyOct 3, 2013

+118725

It is not clear what you really intended this question to be.
It would help if you put some brackets in.

MelodyOct 3, 2013

+118725

You can take it all to one side
4x^2 - 4x - 1 = 0

then use the quadratic formula
that is, if
ax^2 + bx + c =0
then
x=[-b(+ or -) sqr(b^2 - 4ac)] / (2a)

In your case a=4, b=-4, and c=-1

MelodyOct 3, 2013

thank u

GuestOct 3, 2013

+118725

neither

MelodyOct 3, 2013

find lowest common denominator (10)

then, -7/10+43/5

=-7/10+86/10

=79/10

GuestOct 3, 2013

when you divide exponents with like variables all you have to do is subtract the exponents.

=m^9/3

GuestOct 3, 2013

A=Pe^rt
time=t=20 years
P=initial payment=2,000
rate=r=4%=0.04
e=constant

Therefore,

A=2000e^(.04*20)

GuestOct 3, 2013

maybe ur just dumb

GuestOct 3, 2013

+3146

[input]4x^2-4x=1[/input]

adminOct 3, 2013

+3146

[input]1/2+1/3[/input]
[input]0.5[/input]

adminOct 3, 2013

+3146

[input](8500)^(-1/3)[/input]

(8500)^(-1/3) = 1/(8500)^(1/3) = 1/sqrt3(8500)
[input]1/sqrt3(8500)[/input]

adminOct 3, 2013

Your Screwed...

GuestOct 3, 2013

{x2=((-(sqrt(11110985)+1))/2), x2=((sqrt(11110985)-1)/2)}

There you go.

GuestOct 3, 2013

16+14=30

GuestOct 3, 2013

Not sure what you mean, but if you mean how to type it into a calculator, you type it like this:

8500^(-1/3)

GuestOct 3, 2013

Yess....

GuestOct 3, 2013

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