I suspect the last word in the question was meant to be Moon!  Weight is a force.  The mass is the same on Moon and Earth, but the force differs.  

Thankyou anonymous!

$$\Leftrightarrow\left\{ \right\}$$

Yes you can!

inverse tan is the same a arc tan

$$tan^{-1}(ratio)=atan(ratio)$$

now that you know this you should be able to use the calc like any hand held one.

You can use the 2nd button to bring up the inverse function or you can just hold the tan key down a little longer than usual and it will convert to the inverse function.   

Let L = 4W

Then 2(4W) + 2W = 80

Then 10W = 80   and W = 8

And L = 4(8) = 32.

This sequence is neither arithmetic or geometric, so I have no idea what comes next. Sorry :(

It is approximately 58.9

Since the length is four times the width, width is written as L/4.

To find the perimeter you need 2L + 2W=80

So with the given information, your equation should look like:

2(L/4) + 2L = 80

P. S.........there may be some combinatoric that could be found for this, but I couldn't think of any other way to do it!! Anyone else have any ideas??

thurs 8/5/14 through to saturday 10/5/14

This one has not yet been answered

Thank you Chris, you must have been reading my mind. 

Thank you Kitty, that is a good answer.

However, I would also like to see this done using combination notation.

I think the number of diagonals that can be drawn in any poygon with n vertexes (sides), where n >3, is given by: (n)(n-3)/2.

To see this, note that no diagonal can be drawn from a vertex to itself, nor can any diagonal be drawn to the two neighboring vetexes. So this leaves (n-3) vertexes left. And from each vertex, the same number of diagonals can be drawn. So the total number of diagonals that can be drawn is (n)(n-3). But the diagonal from v_i to v_j is the same diagonal drawn from v_j to v_i, so we must divide this total number by two to prevent "double counting."

So we have...... (n)(n-3) / 2.

Yes, that is correct   

I'll take your word for it Foxtears but you should point out that it is an approximation.

If you use the Math(Input=Result) button above to access the site calc it would be much easier for people to check your anwer.

Like this.

$${\sqrt{{\mathtt{128\,745}}}} = {\mathtt{358.810\: \!534\: \!962\: \!394\: \!882}}$$

$$5\times 8\sqrt2=40\sqrt2$$

$$C=2\pi r = \pi r+ \pi r\\

A=\pi r^2 = \pi\times r\times r$$

$$\pi\times C=\pi \times 2\pi r = 2\pi^2r\ne A$$

Does that help?

Thanks reinout-g

The solution give is

$$e^{2ln3}=e^{ln9}=9$$    This is correct for this question, however,

The question as written is 

$$e^2ln3$$     and I do not believe this question can be simplified - although you could use a calc to estimate the answer.

Look here

http://web2.0calc.com/questions/how-do-i-type-in-fractions

$$3 *10^8 / 5*10^{14}= 3 *\frac{10^8}{5}*10^{14}= 0.6\times 10^{22}=6\times 10^{21}$$

If this is not what you meant then you need to learn to use brackets properly.

Only 2 factors - 1 and itself - hence 31 is a PRIME NUMBER

I think I understand what you mean. If the 2x was in parenthesis, then could you call it 4x^2?

This number line shows all the possible values of p. I couldn't get it to exactly start at -2.25, but you get the point. 

*Remember that when graphing an inequality, the circle is closed if it is has a line under the sign.

$$2x^2$$

It cannot be simlified but it means  $$2\times x\times x$$