Which of these items is not a wedge?
a. axe
b. knife
c. ramp
d. ice pick user: how can the mechanical advantage of an inclined plane be expressed as a ratio?
a. length / time
b. mass / length2
c. length / height
d. length * height

I'm assuming the ice pick isn't shaped like a wedge.

For question two, I believe it's length/height (or hypotenuse/height)

Since there are no images given for the problem, i will define the parabola. a parabola is an open curve that is formed when a cone is sliced parallel to the side of it. the key aspects of a parabola when it is graphed looks like a curve that opens upward, downward, leftward or rightward. it has a latus rectum which is the length of the ends of a curved line. the directrix is the distance between the vertex of a parabola and the line. the vertex is the point where the curve ends.