Any values except 0
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For a discrete probability distribution, you add up x*P(x) over all possible values of x, where P(x) is the probability that the random variable X takes the value x. For a continuous distribution you need to integrate x*P(x) with respect to x.
The algebraic equation that equals 300 is x = 300, where x represents the unknown quantity. This equation simplifies to x = 300, indicating that the value of x is 300. In this case, x is a variable representing the unknown value that equals 300 when solved.
the value of x is 3
"x2 = 100" is an equation which, if solved for x, will give you two possible value: 10 and -10.
That depends what the value of x is.