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Guillermo is a professional deep water free diver.
His altitude (in meters relative to sea level), 
x seconds after diving, is modeled by

g(x)=(1)/(20)x(x-100)
How many seconds after diving will Guillermo reach his lowest altitude?
seconds

Guillermo is a professional deep water free diver. His altitude (in meters relative to sea level), x x seconds after diving, is modeled by g(x)=120x(x100) g(x) = \frac{1}{20}x(x-100) How many seconds after diving will Guillermo reach his lowest altitude? seconds \text{seconds}

Full solution

Q. Guillermo is a professional deep water free diver. His altitude (in meters relative to sea level), x x seconds after diving, is modeled by g(x)=120x(x100) g(x) = \frac{1}{20}x(x-100) How many seconds after diving will Guillermo reach his lowest altitude? seconds \text{seconds}
  1. Find Parabola Vertex: To find the lowest altitude, we need to find the vertex of the parabola represented by g(x)=120x(x100)g(x)=\frac{1}{20}x(x-100).
  2. Vertex Form Explanation: The vertex form of a parabola is g(x)=a(xh)2+kg(x)=a(x-h)^2+k, where (h,k)(h,k) is the vertex.
  3. Calculate x-coordinate of Vertex: The x-coordinate of the vertex, hh, is the value of xx that makes x(x100)x(x-100) equal to zero. This is the average of the roots of the equation x(x100)=0x(x-100)=0.
  4. Find Roots of Equation: The roots of the equation x(x100)=0x(x-100)=0 are x=0x=0 and x=100x=100.
  5. Calculate Average of Roots: The average of the roots is (0+100)/2=50(0+100)/2 = 50.
  6. Final Result: So, the xx-coordinate of the vertex is 5050, which means Guillermo will reach his lowest altitude 5050 seconds after diving.

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