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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 is the maximum possible number of mosquitoes?
million mosquitoes

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 is the maximum possible number of mosquitoes?\newlinemillion mosquitoes

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 is the maximum possible number of mosquitoes?\newlinemillion mosquitoes
  1. Identify function type: Identify the type of function.\newlineThe function m(x)=x(x4)m(x) = -x(x - 4) is a quadratic function in the form of m(x)=ax2+bx+cm(x) = ax^2 + bx + c, where a=1a = -1, b=4b = 4, and c=0c = 0.
  2. Determine axis of symmetry: Determine the axis of symmetry for the quadratic function.\newlineThe axis of symmetry for a quadratic function in the form of m(x)=ax2+bx+cm(x) = ax^2 + bx + c is given by the formula x=b2ax = -\frac{b}{2a}. For our function, a=1a = -1 and b=4b = 4.\newlinex=421=42=2x = -\frac{4}{2 \cdot -1} = -\frac{4}{-2} = 2
  3. Calculate maximum value: Calculate the maximum value of the function.\newlineThe maximum value of the function occurs at the axis of symmetry. To find the maximum number of mosquitoes, we substitute x=2x = 2 into the function m(x)m(x).\newlinem(2)=2(24)=2(2)=4m(2) = -2(2 - 4) = -2(-2) = 4
  4. Interpret the result: Interpret the result.\newlineThe maximum possible number of mosquitoes is 44 million when the rainfall is 22 centimeters.

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