Which is the better value 3 sand which’s for 15.00 or 4 sandwiches for 21.00

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

Me, prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle using the parallelogram method and a rectangle method.

Two corresponding sides of two similar triangles are 3cm and 5cm. the area of the first triangle is 12cm^2. what is the area of the second triangle?