Question

The vertices of a rectangle are
Q(−1,1), R(5,1), S(5,−3), and T(−1,−3). What is the point where the diagonals intersect?

Answer 1

the diagonals bisect each other. So that will be
the midpoint of QS
or
the midpoint of RT

I assume you know how to find the midpoint of a line segment.