Homework about TCP Congestion Control

A new TCP connection is made and assuming receiver's window value is always 64 MSS:

1. What is the Congestion Window value after sending 27 full-size (1 MSS) TCP segments? (Unless otherwise noted, all ACKs arrive on time within the same RTT).
2. A new segment is transmitted but a timeout event happens next, what will be the new Congestion Window after sending yet another 15 TCP segments?
3. At that point, what is the Threshold value?
4. Draw the the evolution of the congestion window over time using round-trip time as the time unit of the graph. Use MSS as the unit for the window size.