Brainliest + points! mathematicians needed in 2008, adam lopez set a world record by singing the highest note ever recorded, a c8. that is four octaves above middle c and not on a normal piano keyboard. what is the frequency to the nearest hertz of this musical note if its period is 0.00024? a. 1,873 hertz b. 2,631 hertz c. 3,845 hertz d. 4,167 hertz

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.a city water tank holds 20 gallons of water. a technician empties 25% of the tank. how many more gallons of water must be removed from thetank so that it has 5 of the water that it started with: the technician must removemore gallons of water for the tank to have 5 of the water that it started with.