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A long time

$${\mathtt{9}}{\mathtt{\,\small\textbf+\,}}{\mathtt{10}} = {\mathtt{19}}$$

$${\mathtt{1}}{\mathtt{\,\small\textbf+\,}}{\mathtt{1}} = {\mathtt{2}}$$

good night 

21 hahaha your retarted jk hahahahahaha

Hmmm.....interesting question anonymous.

0 is neither negative nor positive.

It is kind of the median of all numbers.....every number has an opposite except 0

But 0 is a number!  It doesn't have a positive or negative form.

Why,  you may ask,  don't you put a negative sign in front of it?

Because it isn't negative.

Then why, you might ask,  do you leave it alone?  You do the same with positives!

You do have a point there.  But you can add a plus (+) sign in front of a positive too.  Most of the time it isn't necessary,  because you always put a minus (-) sign in front of a negative number,  but you can put the addition sign to show positive numbers.  When you do so,  0 doesn't get one.

So there is your answer!  I liked this question!

please try again

21

$$\int {\frac{ 4 }{ \sqrt{ x^2 }
} \ dx } =4*\int { \frac{ 1 }{ x } \ dx }\\
we \ substitute \ x=e^u \ then \ \ dx=e^u \ du\\
we \ have \ 4* \int { \frac{ e^u }{ e^u } \ du }=4*\int{ \ du }=4*u\\
u=\ln{ x} \\
solution: \ \ 4*\ln{ (x)}+c$$

9+10=21-2 Info: enter a more detailed answer

almost 99% of marriages are the result of a divorce.

if 9+10=21 then 21-10=9

i guess its troo, trolls dont know english. they only know how to be stupid.

Barack Obama was born in the U.S.

america has not lost a war in which donkeys were involved.

Pretty simple : $$N_\tau(t)=N_0e^{-\frac{t}{\tau}}$$ where tau is the decaying time. Thus, you know $$N_\tau(t)/N_0 = 63\% \Leftrightarrow ln(0.63) = - \frac{t}{\tau} \Leftrightarrow t = -ln(0.63)\tau$$ the only thing you have to search the internet for is the decay time $$\tau$$

thanks 

N=N0e^-kt

The original amount doesn't matter.....we''re just looking for the time it takes for 1/2 of the substance to decay.....so we have

(1/2) =e^-(.1092t)    take the ln  of both sides

ln (1/2)  = lne^-(.1092t)   and we can write

ln(1/2) = -(.1092t) lne     and lne  = 1    so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

The cost for one consultant is just the total hours worked x hourly pay...

So we have  9 hrs. x $6.16 hr....???

Now, just multiply this by 23

The area of a rectangle is = Base x Height .....

The gaps in the following graph show that x.floor(x) = M has a solution for some values of M, but not others:

.

sin(75)=cos(?)

I.   sin (75)  = cos ( 90 - 75 )       =  cos ( 15 )

II.  sin (75)  = cos ( -(90 - 75) )   =  cos ( -15 )