Hello! - I just want to make sure this is correct? If not, what did I do wrong? Thanks!

What value of x is in the solution set of 4x - 12 s 16 + 8x? -10 -9 -8 -7

∆red ≅ ∆ by rule will give brainiest if possible

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.