Answer:
A crest is the highest point of a wave.
A trough is the lowest point of a wave.
Infrasound is sound below the limit that humans can hear, below 20 Hz.
Ultrasound is sound above the limit that humans can hear, above 20,000 Hz.
Answer: Yes She is correct
Step-by-step explanation:
Answer:
c
Step-by-step explanation:
-a is closer to 0 than -c meaning its greater. C is bigger than 0 not less than
Answer:
75 000 000
Step-by-step explanation:
45×70= 3150
60×50 = 3000
3150 ... 78750000
3000 ... x
3000×78750000÷3150=75 000 000