Given a isotope with a 3 charge, a mass number of 28, and an atomic number of 13, what are:

Which of the following of the following sets of side lengths could not form a triangle?

Which of the following contains a variable?

Marcus and cody both leave the park at the same time, but in opposite directions. if cody travels 6 mph faster than marcus and after 4 hours they are 64 miles apart, how fast is each traveling? solve using rare times time = distance.