Can the probability that something happens be more than 100%? Explain!

Step-by-step:

When I get a probability higher than  100% , what I do next depends on the circumstances:

If it is the result of a symbolic calculation, I double-check all my steps to see where I made a mistake.

If it is the result of an approximation by computer, and it is only a tiny bit larger, I might assume it is a rounding error.

If it is the result of an approximation by computer and the error is large, I double-check my calculations and my code.

If you are dealing with your basic probability theory, all your probabilities should be in the interval  [0,1] . There are some obscure versions of probability theory that allow for other values, but you’d only encounter those once you get to university level and specialize in this kind of thing.

the final function for the graph becomes x-2=-1. before graphing you solve the equation, where x=1. then graph accordingly.   ( on the x-axis, 1 on the line will possess a vertical line.)

the answer is 15% decrease