If using the method of completing the square to solve the quadratic equation x2+14x-14=0, which number would have to be added to "complete the square"?

The length of triangle base is 26. a line, which is parallel to the base divides the triangle into two equal area parts. find the length of the segment between triangle legs.

The tile along the edge of a triangular community pool needs to be replaced? ?

Which rectangle if translated 6 units right and 16 units down and the rotated 90° clockwise about the point (4, -11) will result in rectangle e?