Question 16 A transmitter is located at a distance 52 km from a receiving base station. What is the free space path loss, in dB, within the communication link for a signal transmitted at 9 GHz? Do not include the units in the answer box. Give your answer rounded to one decimal place.

It's not a graded question, it's a quiz question just can't work out where the answers come from

Calculate the total current of a circuit with a 9.5 V voltage source connected in series with a directly biased silicon diode and a series resistor of 440 Ω. Consider the second approximation of the diode where it is considered to be connected to a battery in series. Units of the response in milli amperes.   Note: I put the original exercise in Spanish, so that it is better understood. Explain step by step, please.