X=30×+45y give the maximum/minimum value

Find the total area for the regular pyramid ( follow the answer set up in the picture)

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side then from the larger side of the rectangle. the perimeter of the rectangle is equal to 56 cm. find the lengths of the sides of the rectangle. 16 points answer quick

State one method by which you can recognize a perfect square trinomial.