Answer:
D
Step-by-step explanation:
Sinusoid graphs look like regular waves.
It is obvious that only I and III look like waves.
II is known as a stepwise function.
What is he doing behind stage
28000 + 3000x = 36000 + 2000x
Subtract 2000x from both sides: 28000 + 1000x = 36000
Subtract 28000 from both sides: 1000x = 8000
Divide both sides by 1000: x = 8.
Let me know if there is more to the problem!
