Identify a common factor (other than 1) of terms in the expression-7x+21. Factor the expression to generate an equivalent expression

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

What is always true when two whole numbers are subtracted?

Write the point-slope form of an equation of the line through the points (-2, -3) and (-7, 4).