The first one is C y=-2x+20 the second ones is 17.6
What is the following sign ??? and the rest of the question I'm sure I can help please provide more info
When waves travel from one medium to another the frequency never changes. As waves travel into the denser medium, they slow down and wavelength decreases. Part of the wave travels faster for longer causing the wave to turn. The wave is slower but the wavelength is shorter meaning frequency remains the same
Answer:
B. 1
Step-by-step explanation:
