Write the Word or Phrase That Best Completes Each Statement $$P = 4 \cos ( 4 t )$$

Essay

Write the word or phrase that best completes each statement or answers the question.
-A mass hangs from a spring which oscillates up and down. The position P of the mass at time t is given by $$P = 4 \cos ( 4 t )$$ What is the amplitude? What is the period?
Graph this function over two periods beginning at t = 0.