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I need to put in the number 10 to the negative nine.

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If you have the [EE] key (sometimes labeled [Exp], or [times 10 to the x], you enter your expression as 1[EE](-9). If you do not have that key you can use the general power key [X to the y] or [Y to the x] or [^] depending on calculator 10[^](-9) = 0.000000001 or equivalently 1.0000x10^(-9)

EE or EXP are shortcuts for times 10 to the power.
Hope it helps.

Posted on Oct 01, 2009


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How do i round this number to the nearest ten billion

Hi Sjonmarie:
Wow! That is a large number that you are playing with.
Starting at the decimal point, you go through the hundreds, thousands, and millions, before you get to the billions.
That is nine digits to the left of the decimal point.
The tenth digit to the left of the decimal is the first billion digit.
The next digit to the left is the 10 billion digit.
If you ignore all of the first nine digits, and
add the tenth digit to the rest of the number, and then
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Whats signifecent about number nine

Don't really know what you are looking for here, but I will give it a shot;)

comes after 8
Comes before 10
Square root is 3
Factors are 1,3, and 9
Squared is 81

9 is also an interesting number because to see if 9 goes into a number evenly, you just add up the digits of the number and see if 9 goes into that number, 9 will go into the number evenly.

For example, to see if 7871847097401 is divisible by 9, let's add up the digits.

7+8+7+1+8+4+7+0+9+7+4+0+1=63 9 goes into 63 evenly, so 0 goes into 7871847097401 evenly. When you add up the digits and get 63, you can also add 6+3 to get 9 and 9 will go into 9 evenly, so 9 goes into 7871847097401 evenly.(p.s. The same process works for the number 3).

Good luck.


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How do I calculate the standard deviation of a group of numbers containing both positive and negative numbers. Simply putting the neg symbol before or after entering the neg number does not give the...

Don't you need to find the distance from the mean and then square it. So for example, if the mean is 10 and the number that you dealing with is negative 15, on your calculator you would enter 10 - (-15) and hit enter and get 25.

Good luck.


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How do you round 3.51795813 to the nearest thousandth



See the above line. The numbers relate to negative powers of ten.

1/1000 is 1x 10-3

Therefore the nearest thousandth is to three decimal places, which is 3.517, though since it is followed by a nine, which is greater than 4, the 7 then has 1 added to it and becomes 8.

The answer, therefore is 3.518.

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Trying to enter Chemistry equations and it won't work...

the way i enter my equations is a bit different from what you're doing, i use the fraction button to do division problems, i just feel it makes it easier to read.
anyway, the fraction button is on the far left, 3rd button down (it looks like a white box on top of a line, and below the line is another empty box). press that, and you can type 1.0x10^-14 on the numerator.
it seems that you haven't discovered the EXPONENT button. that button is on the same row as the fraction button, it looks like an x with a white box next to it. press that once you've typed out "1.0x10", and then type -14. the negative button btw is below the fraction button, and looks like this: (-)
press the right arrow twice on the circle thingy at the top of all the keys, and that'll advance you to the denominator. type 2.0x10^-5, using that nifty exponent key. press the equal sign and it'll solve it for you, all in scientific notation (the answer is 5x10^-10). the problem with this calculator is, it won't expand that answer for you with all the decimals and everything, but if its chemistry that shouldn't be a problem.
also, you can certainly use the "x10^x" button on the very bottom of the keypad (its next to the decimal button). by using this key, you won't have to press the exponent button since you can just type in the exponent directly next to the 10.

as for that negative log of 5.6, just input the negative, the log button is right next to the exponent button, and your number and's that easy :]

i hope you like this caculator, it has so many functions (have you seen the size of the manual??)
good luck on your chemistry test!

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Negitive powers

Use the ^ key to insert a power (it's located above the division key) then put a negative power by typing the negative key (located at the very bottom right of the keypad next to the ENTER key) and then the number of the power.


If this doesn't give the right result, put the negative power in parentheses. I can't remember off hand if you need to do that or not.


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