Louise printed 40 standard photos and 12 wallet photos for a total of $6.96. Marcia printed 25 standard photos and
30 wallet photos for a total of $6.15.
Which system of equations can be used to find s, the cost in
dollars of each standard photo, and w, the cost in dollars of
each wallet photo?

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

look a the sides they are perpendicular

something over 10 so ? /10

step-by-step explanation:

the photograph is photographer and- in the process- ourselves.

step-by-step explanation: