What is the property of equality that justifies if l=m then m=l

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?

If chord ab is congruent to chord cd, then what must be true about ef and eg?

If a company produces x units of an item at a cost of $35 apiece the function c=35x is a of the total production costs