15. a grocery display of cans is arranged in the form of a pyramid 1 canin the top row, 3 in the second row from the top, 5 in the third row, and7 in the fourth row. the total number of cans c equals 2 times the row rminus 1. use the equation c=2r-1 to complete the tablecans.

on number 15?

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