What is the volume of this rectangular prism? 4/3 3/5 3cm

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.

Aright triangle has an area of 21 m2. the dimensions of the triangle are increased by a scale factor of 4. what is the area of the new triangle

Find a third-degree polynomial equation with rational coefficients that has roots -2 and 6+i