A megacity has a population of over 10 million.
The world's first megacities were Tokyo and New York
Using the graph, where in the world are most of the megacities found? List
the cities by continent. An atlas / google search may help you... Slide 4..think
continental areas.

sorry this is for points

reflecting point a across the origin negates both of its coordinates.

b = (5, -4)

because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. so, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.