The equation y equals -5.131 x squared + 31.821 x - 3 .33 3 approximate the number people standing in line to catch a commuter train x hours after 5 a. m. what is the best estimate for the number of people in line at 9 a. m.

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f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

answer:

f(5/2) = 10/3

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