What is the product of 7/8 and 2/7?

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

If f(x) = 4x - 3 and g(x) = x + 4, find (f - g) (x)

What is the gcf of 20c^3-5c^4+30c^6