It is desiredto fdm 30voice channels (each with a bandwidth of 4.5khz) along with a guard band of 0.8khz. ignoring a guard band before the first channel and the one after the last channel, what is the total bandwidth, in khz, required for such a system.

Total bandwidth required  = 158.2 KHz

Explanation:

given data:

number of channel 30

bandwidth of each channel is 4.5 KHz

bandwidth of guard band 0.8 KHz

According to the given information, first guard band and the guard band after last channel should be ignored, therefore we have total number of  29 guard band.

As per data, we can calculate total bandwidth  required

total bandwidth = 30*4.5 + 29*0.8

total bandwidth required  = 158.2 KHz

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)