Determine whether the a-value is positive or negative. Provide an appropriate reason. (1 point) Responses The a-value is positive because the graph is of a parabola that opens up. The a -value is positive because the graph is of a parabola that opens up. The a-value is negative because the x-intercepts are negative. The a -value is negative because the x -intercepts are negative. The a-value is negative because the graph is of a parabola that opens down. The a -value is negative because the graph is of a parabola that opens down. The a-value is negative because the y-intercept is negative.
The correct response is:
The a-value is positive because the graph is of a parabola that opens up.