Answer:
The correct answer is: The slope shows that the average customer rating increased 0.4 points per month.
In the equation y=0.4x+3, the coefficient of x (0.4) represents the slope of the line. In this context, the slope indicates the change in the average customer rating (y) per unit change in time (x), which is months in this case. So a slope of 0.4 means that, on average, the customer rating increased by 0.4 points for each additional month of operation.
Explanation: