Which function has a vertex at (2, -9)? * fx) = -(x - 3)2
Of(x) = (x + 8)2
O fx) = (x - 5)(x + 1)
O f(x) = -(x - 1)(x - 5)

Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?

Is the number 128.439 a rational number