What is the difference of d minus 3 divided by 2 if d = 3?

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?

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.