50 POINT QUESTION I WILL GIVE BRAINLIST IF CORRECT A study showe a correlation between the number of umbrellas sold at a local store and the number of days of inside recess at the nearest school. Which lurking variable would explain the correlation between the number of umbrellas sold and the number of days of inside recess? A. the size of the gym at the school
B. the amount of rainfall in the town
C. the price of umbrellas at the store
D. the number of people wearing rain jackets
E. the distance between the school and the store

the answer might be b why didnt i get  brainlest :(

Step-by-step explanation:

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

the first one, all those points on the line just make a strait line.