posted by Abreanna .
The number of Mosquitoes M9x), in millions, in a certain area depends on the June rainfall x, in inches:M(x)=19x-x^2. What rainfall produces the maximum number of mosquitos?
Your function M(x) = 19x - x^2 is represented by a parabola which opens downwards
find the x of its vertex, that will be the rainfall which causes the most mosquitoes