A wave has a frequency of 500 Hz and a wavelength of 20m. At what speed is this wave traveling? A. 1000 Hz

B. 1000 m

C. 10,000 m

D. 10,000m/s

Pls help!!!

Scientist have use computer models to create a series of maps that show how susceptible coastal cities in island countries are to the sea rising at different levels.the map shows that a 1 meter rise would swap cities all along the us eastern seaboard. a 6-meter sea level rise with sub merge a large part of florida. thermal expansion has already raise the oceans 10 to 20 centimeters the most likely cause,directly and indirectly, for such a rise in sea level is