how does one test whether something is a function or not?
437570
You're probably talking about the vertical line test.  A relation is a function iff you can draw a vertical line anywhere and intersect the function at just one point.\n\nSo, something like y = x is a function because a vertical line always hits just one point.  y^2 = x is not a function because if you draw a vertical line at x=4, it hits the graph at both (4,2) and (4,-2).
818927
if you want f(3)\nyou will have f (2 +1) which leads us to know that 2 is x...\nsubstitute all x's with 2's and then your answer will be revealed
238393
I will Answer On A Sample :\n\n    Delegate Function fns_Operation(ByVal par1 As Double, ByVal par2 As Double) As Double\n\n    Function fns_01(ByVal par1 As Double, ByVal par2 As Double) As Double\n        Return par1 + par2\n    End Function\n\n    Function fns_02(ByVal par1 As Double, ByVal par2 As Double) As Double\n        Return par1 * par2\n    End Function\n\n    Function fns_Operate(ByVal par1 As Double, ByVal par2 As Double, ByVal fns As fns_Operation) As Double\n        Return fns(par1, par2)\n    End Function\n\n    Sub Test()\n        MsgBox(fns_Operate(123, 343, AddressOf fns_01))\n        MsgBox(fns_Operate(3453, 24234, AddressOf fns_02))\n    End Sub
797263
1) True.  A function call 'calls' the function it points to, transferring program control to the statements in the function.\n\n2) False.  The scope of a variable may limit it to being used within a block of code, but that doesn't mean the variable is erased from memory.  Likewise a variable's lifetime may be up within it's scope.\n\n3) False.  A void function returns nothing.\n\n4) True.  A value-returned function may have many return statements.  In fact, a void function may have many return statements which merely return control to the previous scope.
95745
Check the java script.
1149923
(2,-4) if f(x) is defined for x=2
828181
test method for what?
732866
Solve for y to determine if it defines a function:\n\nx² - y² - 5 = 0\n\ny² = x² - 5\n\ny = (x²-5)^1/2\n\nUse the "vertical line test" (a curve is a graph of a function if and only if no vertical line intersects the curve more than once) to determine if this is a function or not.\n\nSince y is the sq.rt. of some number, we can see right away that for every positive value of x²-5, we will have two y's.\n\nTherefore this equation does NOT define a function.
1027060
=IF(AND(A=[condition], B=[condition]),X,Y)\n\nAND will return true if both conditions are satisfied.
620705
In Javascript , there is a predefined function which checks whether a Page is loaded or not.\n\nif(document.readyState == 'complete')\n   // do something.\nThere are few more things which you can get through MSDN also.
736955
1.is not  function as for each value of x there will be two values of y\n\n2.y=3x+7 is a function as for each value of x there will be  a unique value of y
810128
Neither.\n0/0 is indeterminate, or undefined.
75065
enter this sign "=", or click on Fx button beside it to give list of functions
150385
f(x)=Int(f'(y), 0, x)-f(0) => yes, they're opposite operation, but if x has a given value, e.g. x=2, 3...no, they're not, b/c in that case, the RHS of the previous egality is a real number, not a function
567069
make sure that the method ReturnBook is not a void but instead returns a boolean value.\n\nIf you want to follow the standard java naming conventions rename the method to "returnBook". Methods typically start with a small letter.\n\nkeep a bookmark to this page that contains all possible\njava compiler error messages for future reference:\n\nhttp://mindprod.com/jgloss/compileerrormessages.html
593098
check it.\nMay be it is useful
472136
False. For example: F(x)=x^2 increases for x>0.\n\nF(x)=x^3 always increases.