In a group of 40 students, 25 applied to columbia and 30 applied to cornell. if 3 students applied to neither columbia nor cornell, how many students applied to both schools?

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?

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?