- solve the problem by forming a pair simultaneous equations. - find two numbers with a sum of 13 and difference of 4.

- a bird can lay brown or white eggs .3 white and 2 brown eggs have a mass of 13 g. while mass of 5 white eggs and 4 brown eggs have a mass of 24g . find the mass of one white and one brown egg.​

1) your first question answer is some pictures you see.

2) I don't know

3) I don't know.

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