Hi guys, Thanks for all help in advance.
A question requires me to find t in seconds.
h = 13 m
13 = -10 cos (πt/15) + 11.
13-11/-10 = cos (πt/15)
cos^-1(1/5) = 78.5
78.5 = πt/15
is what im doing right so far? im required to convert 78.5 degrees to seconds, im unsure how to do this. =(