All Answers 358146 Answers

Density = mass / volume; since we are given density and volume, we solve for mass.

Note that 280 cm^3 is not a mass but a volume.

d = m/v

m = v*d

m = 280 cm^3*0.0043 g/cm^3 (I assume it is g/cm^3)

m = 1.204 g.

7.53000321 * 10^8 (We need something in the format of #.###... * 10^#).

Look at the e+17 which means 10^17.

This means that you move the decimal place to the right 17 times and add 0s on the way.

You could just input this into the on-site calculator on the home page as well.

e^2 = 0.13533

False; e^2 = ~7.4.

What needs to be done here?

tan(90) = 44/x

x*tan(90) = 44 <--- Cross multiply the original equation.

Divide by tan(90):

x = 44/tan(90).

Use the calculator on the home page to solve this. Make sure it is set to degrees, which it is by default.

What is Point A? Also, this doesn't question doesn't make sense because there is an expression followed by a part of another question? Perhaps two questions?

w+w+(w+8)+(w+8)=52

4w+16=52

you can probably solve this.  

then you know that l=w+8   

$$\\4logx^{3}-3logx^{2}=12\\
log(x^3)^4-log(x^{2})^3=12\\
log(x^{12})-log(x^6)=12\\
log(\frac{x^{12}}{x^6})=12\\
log\;x^{6}=12\\
6log\;x=12\\
log\;x=2\\
10^{log\;x}=10^2\\
x=100$$

Log(36,10) + 2log(5,10) - log(9,10)

$$\\log36+2log5-log9\\
=log36+log25-log9\\
=log(36*25/9)\\
=log(100)\\
=2$$

$$\begin{array}{rlll}
-2i(2+5i)&=&x+6i\\
-4i-10i^2&=&x+6i\\
-4i+10&=&x+6i\\
-10i+10&=&x\\
x&=&10-10i\\
\end{array}$$

The ones that graph to a line with a positive gradient are directly proportional to.  

And I put it on my watch list. Thanks 

I told my friends about it at school. I give you points because I like the threads, even if they are boring.

Well they are both over 2 in that this is true

$$\frac{125}{2}+\frac{81}{2}=\frac{125+81}{2}$$

but you wouldn't do it like that

You would just add up the top and THEN divide by the bottom.  It's much quicker.  

I was trying to finds a good page for you but I couldn't find one that I was completely happy with

basically if two things have direct variation then as one gets bigger so does the other - and vise versa

the example in the first web page is distance traveled and time taken.

time taken is directly proportional to distance travelled because 

the longer the travel time the futher you travel.

Have a look at these web pages if you want more into.    

I just found a whole heap more on pages 663 and 664 .

rplcmnt       7 consonants

eeea           4 vowels

P(vowel then not a vowel) = 4/11*7/10

Oh here is your message.  Yes I am !!

the only old question left are a few on page 666 and a couple of hard looking financial question.

$$a_n=a_1*r^{n-1}$$

You mean why is it?

Let's look at a GP

$$The first term is $a_1$\\
The second term is $a_1*r$\\
The third term is the second term *r = $a_1*r*r = ar^2$\\
The forth term is the third term *r = $a_1r^2*r = ar^3$\\
following the pattern,
The twenieth term is going to be $ a_1r^{19}$\\
and\\
The nth term is going to be $ a_1r^{n-1}$\\\\
I hope that that helps.$$