How do you justify GF = GF as a step in a proof?

Can someone please help me with this

As soon as look at the parallelogram abcd shown below: the table below shows the steps to prove that if the quadrilateral abcd is a parallelogram, then its opposite sides are congruent: which choice completes the missing information for reason 5 in the chart? (6 points) congruent parallelograms congruent triangles similar angles similar triangles

Which of the following is true for the relation f(x)=2x^2+1

Find the multiplicative inverse of 8-12i