How many and what type of solutions does the equation have? 5y2 = 187 – 4

For the function, f(x) = -5x 2, find f(-4).

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The random variable x is the number of occurrences of an event over an interval of ten minutes. it can be assumed that the probability of an occurrence is the same in any two-time periods of an equal length. it is known that the mean number of occurrences in ten minutes is 5.3. the appropriate probability distribution for the random variable