Having difficulty understand this concept. I would appreciate any help

Ecology Increasing numbers of manatees have been killed by boats off a state's coast. The following graph shows the relationship between the number of boats registered in that state and the number of manatees killed each year. l00 Manalcedeaths o 8 8 3 8 Boats (100,000) The regression curve shown is given by f(x) = 3.59x2 30le + 81 manatee deaths (4.5 S X S 8.5), where X is the number of boats (hundreds of thousands) registered in the state in a particular year and f(x) is the number of manatees killed by boats in the state that year. Compute f'(8). f'(8) = matinee deaths per 100,000 additional boats Interpret your answer. At a level of 800,000 boats, the number of manatee deaths was increasing at a rate of per 100,000 additional boats