:A metal cube dissolves in acid such that an edge of the cube decreases by 0.49 mm/min. How fast is the volume of the cube changing when the edge is 9.3 mm?

A) -42 mm^3min B) - 127 mm^3/min C) -530 mm^3/min D) -394 mm3/min

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

6 and 24

step-by-step explanation:

6 x 4 = 24

mr. india