Help, it's an emergency ​

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

Work = force × a. work b. energy c. distance d. momentum

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