Can someone me ! someone has yet to answer my questions! i will greatly appreciate it! (anxious)

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

Two polarizers are oriented at 40∘ to each other and plane-polarized light is incident on them. if only 16 percent of the light gets through both of them, what was the initial polarization direction of the incident light?

The air that we breath is made mostly of which gaseous molecule