Which of the following statements is true?All materials are good conductors of electricity. Aluminum and steel are good conductors of electricity. Gold and wood are poor conductors of electricity. Plastic and cooper are good conductors of electricity. Please help this is for my science homework and it's for half of my grade!

Determine the maximum r-value of the polar equation r =3+3 cos 0

What is a carrier wave and how does it affect what you hear on the radio

Although longitudinal waves can travel through all media types what is the disadvantage of this type of wave transmission? a) he efficiency of he wave transmission is greatly diminished as the media becomes less dense b) the oscillation of one set of particles has a huge impact on neighboring particles c) particles become too close together as they bump into each other making it more likely to hit other particles down the line