Is x^2+y-15=10 a relation and a function?

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?

Find the value of x for which abcd must be a parallelogram -9-6x x-30

The holiday party will cost $160 if 8 people attend.if there are 40 people who attend the party, how much will the holiday party cost