answer quickly I need help
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PLEASE POST ONE QUESTION AT A TIME OR ELSE IT BECOMES DIFFICULT TO ANSWER, HOPE YOU UNDERSTAND.
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hope this helps you.
Explanation:
16. 425 Hz.
17. 250 Hz.
18.
19.
20. Refraction.
21. 9/4
22. (b)
23.
24. increases
25. 2C
26. (a)
27. (d)
28. increases.
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