what is the mathematical symbol for "no change" or "amount not changed"?
366569
One possible symbol would be upper case delta (triangle) with a diagonal line through it, since delta represents change, and putting a line through something, general means not this (think of not equal).
519094
Yes, zero is a number with a special property x + zero = x.\n\nIn most numeral systems, there is no zero symbol.\n\n0 is a digit who's name is zero.\n\n0 is not 'nothing'.  It is a number that can represent the cardanality of an empty set.\n\nThe greek capitol letter Phi (a circle with an up down line through it) is used to represent the 'empty set' or the set with nothing in it.
263481
There is a symbol.  It is just different depending on which Tbill expiration you are checking.  Go to the following link and you can find the symbl you need.  http://www.tradesignals.com/summary/search/T-Bill%2090%20Day
938863
I didn't check all your numbers, but your approach is correct.\nIn the first formula after the words "My Approach," the first minus sign should be plus. But you corrected that in the subsequent formulas, so I assume that's just a typo.
339198
2x0 = 0\nIt'll be the same as today... :P
629310
nything that doesn't involve either zero or U
142152
integration sign.\nWhen reading a formula, you simply read it "integral of" if there are no boundaries, or "integral from a to b" if there are boundaries a (lower) and b (upper)
391974
The dollar sign is used for absolute reference.\n\n$A1 means that although the row can change, the column will always be A.\n\nA$1 means that although the column can change, the row will always be 1.\n\n$A$1 means that the cell A1 will always be used no matter how many times you copy the formula.
510782
without rounding (as in not rounding up/down on math problems).
887265
Please double check the output because there is no pattern.  Also add the level of Math this is
930538
in the calculator the symbol for arctan is tan^-1 ( tan to the minus 1) '
562003
a minus sign with a dot above it and a dot below it.\n\nMENTALLY SUPERIMPOSE THESE TWO CHARACTERS \n:-
99187
This was a form of math that gained a small following several years ago with the Hmong of Thiland. It's not used very much today due to its limited application.   Edited comment:  Pastor Dave is correct, it's still used. I think it was also used for a few months at Enron, Corp.
142243
http://www.pinksheets.com/quote/news.jsp?symbol=NMCX
918247
what it means is this 4 plus negative .01 and with the other it's 5 plus negative .04 its simple. if you know what it means and if you took notes look at them. it may help a little
935481
you switch the inequality sign when you divide by a negative number.
798085
Your instructor is an idiot.\nThere is no commonly accepted notation in math which puts a dot over a natural number.\nI'm really sorry that you have a numbskull for a Calculus teacher.