Which phrase correctly describes the expression 4 x 3-1 ?

What is the answer to |-2x-5|-|-4+8| and x=7

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

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