Which equations are quadratic? Check all that apply.
A. 2x2 + 3 = 0
B. x3 – 7x+ 1 = 0
C. 4x2 + 8x = 0
D. 5x – 12 = 0
E. x2 + 2xy + 9 = 0
F. x2 + 2x + 7 = 0

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?

Ineed me i stuck and i don’t want to get it wrong

Without multiplying, tell which product is larger and why. 5 × 1/3 or 5 × 2/3 a)5 × 1/3 because 1/3 is less than 2/3 b) 5 × 1/3 because 1/3 is greater than 2/3 c) 5 × 2/3 because 1/3 is less than 23 d) 5 × 23 because 1/3 is greater than 2/3