I need help with these question from physics. I decided to take on an extra practice worksheet to study but I'm stuck. Please solve and explain the questions below. Everything is given in the attachments, thanks!!

Question 11 A periodic longitudinal wave that has a frequency of 20.0 Hz travels along a coiled spring toy. If the distance between successive compressions is 0.600 m, what is the speed of the wave? m/sQuestion 9 The Willis Tower in Chicago sways back and forth in the wind with a frequency of about 0.12 Hz. What is its period of vibration? (Round to the nearest tenth) SQuestion 2 The speed of sound at room temperature (20.C) is 343 m/s. If the speed of sound in air increases about 0.60 m/s for every 1'C increase, what is the speed of sound when the temperature is 45 C? m/sQuestion 10 Observing a guitar string, you see 7 antinodes as it resonates. How many standing waves are there? If the frequency of vibration is 1925 Hz, what is the natural frequency of the string? What is the guitar string's 4th harmonic