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How I understand it is: 3km-8km=-5km. So if you want to see this visually draw a number line from -5 to +3. Start at +3 and subtract (walk backwards) 8 spaces. This will lead you to -5. :) Don't forget to include 0 in the middle of your number line!

Hope this helps! :)

If you still don't understand it ask me for more advise, I'd be happy to help!

Clearly I'm not a very mathematical person XD

But would you mind explaining what in 925/in 3 means. what does the 'in' bit actually mean?

Ok, so it's the second of my replies above that is the one you want.

sorry I didn't explain myself properly; When I said the 't' is squared I meant that the 't' is actually raised instead of an actual number. a=75+3^t   

^{Sorry, I just literally found out how to make the 't' raised, sorry.}

If you mean \(a=75+3^t\) then you get  \(3^t=925\)

Here you need to take the logarithm of both sides:  \(\ln{3^t}=\ln{925}\)

Now use the property of logarithms that ln mⁿ = n*ln m:   \(t\ln3=\ln{925}\)

So  \(t=\frac{\ln{925}}{\ln3}\)

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If you have \(a=75+3t^2\) and you want to find t when a = 1000, then write  

\(1000=75+3t^2\)

Rearrange this to get:  \(t^2=\frac{1000-75}{3} \rightarrow t^2=\frac{925}{3}\)  

Take the square root:   \(t=\sqrt{\frac{925}3{}}\)

I've worked out A) and B) btw. tell me if you need them to work C) out :)

Like this:

Then press Enter

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Use the Formulary here to find useful equations.  For the sphere go to: http://web2.0calc.com/formulary/math/geometry/sphere 

Hallo Guest

The denominator must not 0 (null).

The denominator is 0, if

 \(\begin{array}{rcll} x+1 &=& 0 \quad & | \quad -1\\ x+1-1 &=& 0-1 \\ x+0 &=& -1 \\ x &=& -1 \end{array}\)

so \(x=-1\) is not permissible or \(D = R ~ \backslash ~ \{-1\}\)

\(\dfrac{-2x+3}{x+1} > 1\)

Hallo Guest

The denominator must not 0 (null).

The denominator is 0, if

 \(\begin{array}{rcll} x+1 &=& 0 \quad & | \quad -1\\ x+1-1 &=& 0-1 \\ x+0 &=& -1 \\ x &=& -1 \end{array}\)

so \(x=-1\) is not permissible or \(D = R ~ \backslash ~ \{-1\}\)

\(\dfrac{-2x+3}{x+1} > 1\)

1 mole is 6.022 x 10²³ (that's just something you have to memorize)

To convert units,

 2.98 x 12²³ atoms

6.022x10²³atoms/mol      =  2.98e23/6.022e23 = 0.4948522085685819 mol 

Simple, since you have the f(x) function already, all it's telling you is to plug in 3 where x is.

you don't, in soviet russia, exponents put you into calculator

Your title is too long, also the question is oddly phrased, do you mean "take up less room"? Scientific Notation is how you list really big numbers in a small amount of space, so 

1372000000000000000 = 1.372 x 10¹⁸  and 1436755040241732107.72 = 1.437 x 10¹⁸

2+ 25 = 27

PV=FV{1 + .06/365}^(-2.5*365)

PV=1,000{1.00016438}^-912.5

PV=1,000{0.86072}

PV=$860.72

hello, there were still things i couldnt understand.

for example the first part of the answer were u had put in that D=R \{-1}...I would like to know how you got -1 as answer.

Further on i would like to know were f(x)-g(x)>0 can be found in a graphic (if this exist and is possible)

If you want to put an exponent bgger than 2 then use the ^ button then nput the exponent after it.

Example: 500 to the power of 5456 = 500^5456

3^6 

Means 3 to the power of 6.

Start by factoring out 2x

Hold up bro, I think I know what he is talking about...

sq()=sqare root

5sq(48)

1.) Take the sq apart to find a perfect number.

sq(48)=> sq(16*3)=> sq(16)*sq(3)

Simplify:

5*4*sq(3)

20sq(3)

Does that help?

you can factor out all the (x)'s as thats what they all have in common and then solve it for its zeroes or use the quadratic formula