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It means the value of the function equals zero when the argument is 4. For example: f(x)=x-4 f(4)=4-4=0
The y-intercept is the value of the function when 'x' is zero. That is, it's the point at which the graph of the function intercepts (crosses) the y-axis. The x-intercept is the value of 'x' that makes the value of the function zero. That is, it's the point at which 'y' is zero, and the graph of the function intercepts the x-axis.
Nothing. 3/4 means three fourths 0/0 is therefore no nothings.
0any number, or series of numbers, multiplied together (product) with zero equals zero; and the absolute value of zero is zero.
Any number to the power zero equals 1. A possible exception is zero to the power zero. Some people claim it is equal to zero, others say it equals one, consistent with any other value. Still more say that the result of zero to the power zero is an undefined value. With the possible exception of zero, the statement above holds true for any value.