What is the y-intercept of the line described below? y=3x+5

What is the equation of the following graph in vertex form? parabolic function going down from the left through the point zero comma twelve and through the point two comma zero and turning at the point four comma negative four and going up through the point six comma zero and continuing towards infinity courtesy of texas instruments a: y = (x − 4)2 − 4 b: y = (x + 4)2 − 4 c: y = (x + 2)2 + 6 d: y = (x + 2)2 + 12

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a. p.