ohgeezy
29.01.2021 •
Mathematics
PLS HELP
A west Texas city has a population of 9,525. A city council poll revealed that 56% of the citizens want a fireworks display for the upcoming 4th of July celebration. How many of the city’s people want a fireworks display for the 4th of July?
560 people
4,191 people
5,334 people
8,965 people
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Ответ:
Step-by-step explanation:
f(0) = 8 {y-axis intercept = (0, 8)}
Vertex = (1, 9)
f(x) = a(x - 1)² + 9
8 = a(0-1)² + 9
8 = a + 9
a = -1
f(x) = - (x - 1)² + 9
f(x) = - (x² - 2x + 1) + 9
f(x) = - x² + 2x - 1 + 9
f(x) = - x² + 2x + 8
x₁ = -2 and x₂ = 4, so also:
f(x) = -(x + 2)(x - 4)