Victor transformed square abcd and verified that figure abcd and figure cfed are congruent.

which transformation describes how victor transformed square abcd?
a.
a translation 2 units to the right
b.
a 90° clockwise rotation around point d
c.
a reflection across line segment bc
d.
a reflection across line segment ab

Victor transformed square ABCD and verified that figure ABCD and figure CFED are congruent. The transformation describes how Victor transformed square ABCD is that a reflection across line segment AB. The answer is letter D.

a_n = a_1 + (n - 1)d

the first term is 6.

the common difference d = ?

when you find d, replace n with 7 and d with the common difference to find your answer.