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The number of mosquitoes in Brooklyn (in millions of mosquitoes) as a function of rainfall (in centimeters) is modeled by

m(x)=-x(x-4)
What amount of rainfall results in the maximum number of mosquitoes?
centimeters

The number of mosquitoes in Brooklyn (in millions of mosquitoes) as a function of rainfall (in centimeters) is modeled by\newlinem(x)=x(x4)m(x)=-x(x-4)\newlineWhat amount of rainfall results in the maximum number of mosquitoes?\newlinecentimeters\text{centimeters}

Full solution

Q. The number of mosquitoes in Brooklyn (in millions of mosquitoes) as a function of rainfall (in centimeters) is modeled by\newlinem(x)=x(x4)m(x)=-x(x-4)\newlineWhat amount of rainfall results in the maximum number of mosquitoes?\newlinecentimeters\text{centimeters}
  1. Identify Quadratic Function: To find the amount of rainfall that results in the maximum number of mosquitoes, we need to analyze the given quadratic function m(x)=x(x4)m(x) = -x(x - 4), which is a parabola that opens downwards (since the coefficient of x2x^2 is negative). The maximum value of this function occurs at its vertex.
  2. Find Vertex Formula: The vertex of a parabola in the form of f(x)=ax2+bx+cf(x) = ax^2 + bx + c can be found using the formula x=b2ax = -\frac{b}{2a}. In our case, the function m(x)=x(x4)m(x) = -x(x - 4) can be rewritten as m(x)=x2+4xm(x) = -x^2 + 4x. Here, a=1a = -1 and b=4b = 4.
  3. Calculate Vertex: Using the vertex formula x=b2ax = -\frac{b}{2a}, we substitute a=1a = -1 and b=4b = 4 to find the xx-coordinate of the vertex, which will give us the amount of rainfall that maximizes the number of mosquitoes. So, x=42(1)=42=2x = -\frac{4}{2*(-1)} = -\frac{4}{-2} = 2.
  4. Determine Maximum Rainfall: The xx-coordinate of the vertex is 22 centimeters. This means that 22 centimeters of rainfall results in the maximum number of mosquitoes according to the model m(x)=x(x4)m(x) = -x(x - 4).

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