Which sequence represents the relationship between pressure and volume of an ideal gas as explained by the kinetic-molecular theory?

Idon't understand what to put on the left lines i'm confused can anyone ?

Which statement accurately describes the relationship between air pressure, air density, or altitude? as altitude increases, pressure increases.as altitude increases, air density increases.air pressure and density are lowest at sea level.denser air exerts more pressure than less dense air.

For each of the following types of reactions, write a general reaction formula in the symbolic form—for example, a + b → ab. single-displacement double-displacement synthesis decomposition