First of all you need to find the coordinates of each points in the graph. Second is to find the slope or the rise over run of the graph when it is connected to every points. The third is to apply the formula in solving the function by assigning each value. The formula is Y=MX+B
She is starting at 4000, so that is the y-intercept of the graph. She is descending at 40 feet per minute, so her rate of change or slope is -40. The graph would look like this:
Answer:
the top of a lighthouse is 250 feet above water level to the water line of a ship 2.5 miles offshore.
Step-by-step explanation:
I'd say that the answer would be -9 or 9