Please help Due at 11:59 I’m lost.

What is special about a dc circuit ?

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?

Amass weighing 24 pounds, attached to the end of a spring, stretches it 4 inches. initially, the mass is released from rest from a point 8 inches below the equilibrium position. find the equation of motion. (use g = 32 ft/s2 for the acceleration due to gravity.)