One angle of a triangle is obtuse. The sum of the measures of the other angles must be A. more than 90 degrees B. less than 90 degrees C. equal to 90 degrees help i need this 10 points please

In a quadratic function of the form ax^2+bx+c, which of the following is not true? a. the y-intercept is c. b. if a is positive, the parabola opens up. c. the vertex has an x-coordinate of -b/2a. d. the axis of symmetry is the line y=-b/2a.