Mathematics

Aedan

12 August, 18:49

A buoy floats on the surface of the water. The height in meters of the buoy 't' hours after midnight, relative to sea level, is given by the equation f (x) = 5cos (pi/6) t + 4. Estimate how many hours elapse between the first two times the buoy is exactly 6 m above sea level.

a.) 2.2 hours

b.) 5.8 hours

c.) 6.4 hours

d.) 7.6 hours