In vietnam, a conventional force (the unites states) opposed a guerilla force (the vietcong). this conventional foce y(t) is out in the open to be shot at; its combat loss rate is limited only by the number of the x-force that can shoot. so the model for vietnam is dx/dt = -ady, dy/dt = -bx.

the answer is false

explanation:

force tends to be low and long diustance masses are high

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods