Wave riddle need help

1. What is the frequency of a wave moving at 35 m/s that has a length of 2.1 meters? 2. What speed will a sound wave have if its frequency is 110 Hz and the wave measures 3.5 meters crest to crest? 3. What is the frequency of a pendulum that takes 4.6 s to make a complete swing back and forth? 4. What is the period of a sewing machine needle that oscillates 250 times in 10 seconds? 5. A student plays a 440 Hz note that travels through the air at 340 m/s. What is the wavelength of this wave? 6. If it takes 1.5 seconds for a wave to pass by and the distance from one wave to the next is 6 meters, how fast is the wave traveling? 7. A sound wave travels at 1500 m/s through water. What is the wavelength of a bottlenose dolphin vocalization if its frequency is 12,000 Hz? 8. The speed of a wave on a guitar string is 405 m/s_If the G string of a guitar plays a 196 Hz tone, what is the wavelength of the wave produced on this guitar string? Where do musical notes surf? On sound waves! 16.7 Hz 385 m/s 0.22 Hz 0 04 s 0.77 m 4 m/s 0. 125 m 2.1 m