What is the equation of the line in slope-intercept form?

The function ƒ is defined by ƒ(x) = (x + 3)(x + 1). the graph of ƒ in the xy-plane is a parabola. which interval contains the x-coordinate of the vertex of the graph of ƒ?

Can someone pls ! pls answer all. no explanation needed..

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c