The telephone cable cable in the illustration currently runs from a to b to c to d. how much cable is required to run from a to d? ab=105 bc=65 cd=51

will literally venmo someone $5.00 if they can get the correct answer

The answer is 105+65+51=221
Don't give me money

The amount of cable required is the distance from a to b to c to d
Meaning you pass through these four points.

The distance from a to b is 105
The distance from b to c is 65
The distance from c to d is 51

Look closely at the question. The cable will first go a to b, then from b to c, then from c to d. (draw a picture if it's hard to understand)
So to find the length of the cable, just add these distances
105+65+51=221