I got the wrong answer on the following three questions. Can someone tell me how

Question

I got the wrong answer on the following three questions. Can someone tell me how they calculated the Rss in the question below.

A system operating on a frequency of 850Mhz has an output power of 80 watts. The transmitter feeds a length of feedline that has 9dB of loss and an antenna that has 29dBi of gain. The path loss is 112dB. The receive antenna has 10dBi of gain and feeds the receiver through a feedline that has 4db of loss. What is Rss? (enter the numbers only - not the units)

Answer: -37

A system operating on a frequency of 900Mhz has an output power of 10 watts. The transmitter feeds a length of feedline that has 10dB of loss and an antenna that has 7dBi of gain. The path loss is 95dB. The receive antenna has 18dBi of gain and feeds the receiver through a feedline that has 5db of loss. What is Rss? (enter the numbers only - not the units)

Note: Round all calculations to the nearest dBm (no decimal places).

Answer: -45

A system operating on a frequency of 250Mhz has an output power of 1 watt. The transmitter feeds a length of feedline that has 7dB of loss and an antenna that has 7dBi of gain. The path loss is 94dB. The receive antenna has 18dBi of gain and feeds the receiver through a feedline that has 5db of loss. What is Rss? (enter the numbers only - not the units)

Note: Round all calculations to the nearest dBm (no decimal places).

Answer: -51

Explanation / Answer

-37,-45,-51

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