A school counselor meets individually with 18 students every week. Throughout the week, the counselor also meets with other students in groups of 5. Which equation best represents the linear relationship between x, the number of small groups the counselor meets with, and y, the total number of students the counselor meets with each week? A. x=5y+18
B. x=18y+5
C. y=18x+5
D. y=5x+18
PLEASE HELP

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.

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