mr west has a picture that is 4 inches wide and 7
inches long. he wants to enlarge it so that it is 19
inches long how wide should the picture be?

10  6/7 inches

Step-by-step explanation:

Ratio (k) = image/pre-image

  k= 19/7

4 x 19/7  = 76/7 = 10 6/7  

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