Which monomial represents the number of square units in the area of a circle whose radius is 3x^3 units? ​

For how answer my question this will be the last question can you answer in math subject

Aconstruction worker has rope 9 m long he needs to cut it in pieces that are each 3 /5 m long how many such pieces can he cut without having any rope leftover?

Asinusoidal function whose frequency is 1/6pi