The population of a small town can be modeled by p = -310 + 12,800, where t is the
number of years since 2010. interpret the slope of the graph of this function as a
rate of change.

The sum of P(A) and P(B) is not equal to P(A or B).

Step-by-step explanation:

We have that:

The probability for event A is 0.3, P(A)=0.3

The probability for event B is 0.6  P(B)=0.6 and  

The probability of events A or B is 0.8, P(A or B)=0.9

For mutually exclusive events,

Let us check and see if this is true

......This is not true

Therefore events A and B are not mutually exclusive because the sum of P(A) and P(B) is not equal to P(A or B).