Calculate the speed of a wave with a frequency of 2 Hz, amplitude of 3m, and a wavelength of 10m

An airport in death valley is 60 feet below sea level, and an airplane is flying 2,000 feet above sea level. how many feet must the plane descend in order to land? a. 2060 b. 2000 feet c. 1940 feet d. 1880 feet e.1400 feet will mark as brainliest

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Find the domain of the following expression: 1/(√x)-2