3.6x = 0.6x + 13 I really need help

A) equal lines b) parallel lines c) perpendicular lines d) none of the above

Which of these statements describes the size of an atom? a. an atom is larger than a sheet of aluminum foil. b. an atom is small but can be seen with just our eyes. c. an atom is the size of a plastic building block. d. an atom is tiny and cannot be seen without magnification.

How can a ringing telephone can be heard through a closed door