Which of the following equations represents a quadratic function?
1.y(y + 4)(y - 6) = 0
2.(2x - 3)(4x + 5) = 10x
3.(3b)(5b – 7)(b + 8) = 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?

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.