Martha works at a small jewelry store. she designs 2 rings in the first hour. every additional hour, she designs 3 new rings. select all the functions that can be used to find the number of rings, r(n), she designs in n hours.

Mr. walker gave his class the function f(x) = (x + 3)(x + 5). four students made a claim about the function. each student’s claim is below. jeremiah: the y-intercept is at (15, 0). lindsay: the x-intercepts are at (–3, 0) and (5, 0). stephen: the vertex is at (–4, –1). alexis: the midpoint between the x-intercepts is at (4, 0). which student’s claim about the function is correct?

What is the vertex form of f(x) = x2 + 6x + 3

When y’all answer can y’all explain too !