I don’t understand this

The function ƒ is defined by ƒ(x) = (x + 3)(x + 1). the graph of ƒ in the xy-plane is a parabola. which interval contains the x-coordinate of the vertex of the graph of ƒ?

An isosceles trapezoid was broken into a rectangle and two triangles. what are the base and height of one of the triangles?

Tom is buying topsoil for the flower bed shown below. one bag of topsoil covers 15 square meters. how many bags of topsoil does tom need to cover his flower bed?