2 5/8 x 1 2/3 = In simplest form

Simply 8x squared + 5(7x squared- x) - 2x =

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

How many $20 bills do you need to have to make $280