A company that makes hair-care products had 3,000 people try a new shampoo. Of the 3,000 people, 12 had a mild allergic reaction. What percent of the people had a mild allergic reaction?

0.4%

Step-by-step explanation:

12/3,000 = 2/500 = 0.4%

Hope this helps!      :3

plz mark as brainliest!

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this