Which statements include two quantities in the real world that are additive inverses? select each correct answer. a. a diver descends 18 feet and then ascends 5 feet. b. a person pours 6 ounces of water out of a glass and then pours 6 ounces of water back in to the glass. c. the outside temperature increases 15 degrees from the morning to the afternoon, and then decreases 6 degrees from the afternoon in to the evening. d. a person loses 12 points playing a game and then earns 12 points.

Did the test B and D are correct

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