I need to know the answer to this and I do not need an explanation

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

Afisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. it takes a time of 2.70 s for the boat to travel from its highest point to its lowest, a total distance of 0.700 m. the fisherman sees that the wave crests are spaced a horizontal distance of 6.50 m apart. a. how fast are the waves traveling? b. what is the amplitude a of each wave?

Frequency of electromagnetic waves that a radio station is assigned. what do you call this type of wave?