Angle FBC is 67
you would figure this out using supplementary angles and the Z pattern
The midpoint of the range of frequencies given is:
midpoint = (82.4 +
659.2) / 2 = 370.8 Hertz
Then the difference from midpoint to the other end is:
370.8 - 83.4 = 288.4 Hertz
Therefore the inequality formula is
|f - 370.8| <= 288.4
Answer:
67
Step-by-step explanation:
To find exterior angles you add non-adjacent interior angles.