Need help with a Wireless Networking Communications problem: (Computer Science, Data, IT and Math related), thanks.

Assume an urban area cellular radio scenario: Use a path loss exponent of n = 3.1 and a transmitter power of 50 w.

Part 1: What is the range of path loss exponents for this environment?

Part 2: If the transmitters power is applied to a unity gain antenna with a 900-MHz carrier frequency, what is the received power in dBm at a free space distance of 100 M?

Part 3: Repeat (part 1) for a distance of 10 km

Part 4: Repeat (part 2) but assume a receiver antenna gain of 2