Final answer:
The zero of the quadratic expression -0.5x² + 22x - 224 represents the x-intercept of the parabola, which is the point where the graph intersects the x-axis.
Step-by-step explanation:
The zero of the quadratic expression -0.5x² + 22x - 224 represents the points where the graph of the quadratic function intersects the x-axis, which are the x-intercepts of the graph. The coefficient of the x² term is negative (-0.5), indicating that the parabola opens downwards. This means that the vertex of the parabola is a maximum point. However, the question specifically asks what the zero of the expression represents, not the vertex, so the correct answer is c. The x-intercept.