18.725 = 18725/1000 = 3745/200 = 749/40 = 18 29/40
so, your answer is 18 29/40
B
given f(x) in factored form, equate to zero for x-intercepts
(x - 8)(x - 4) = 0, hence
x = 4, x = 8 ← x- intercepts
The vertex lies on the axis of symmetry which is situated at the midpoint of the x- intercepts
x- coordinate of vertex =
= 6
f(6) = (6 - 8 )(6 - 4 ) = -2 × 2 = - 4 ← y-coordinate
vertex = (6, - 4 ) → B
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10 because there is 4 zero's behind the one. Hopes this helps!! :)
D'
you can't use the same single letter to mark a new point.