Which of the following would be a line of reflection that would map ABCD onto itself?

Square ABCD with B at 1 comma 3, A at 1 comma 1, D at negative 1 comma 1, and C at negative 1 comma 3.

x = 1
−x + y = 2
x − y = 2
2x + y = 3

Aliter of water contains about 3.35 x 10^25 molecules. a certain river discharges about 2.9x 10^8 l of water every second. about how many molecules does the river discharge every minute? write your answer in scientific notation