An airplane us asked to stay within a holding pattern near ab airport. The function d(x)=70sin(0.67x)+120 represents the distance d, in miles, that the airplane is from the airport at time "x", in minutes.
During the first 21 minutes after the plane enters the holding pattern at what time "x" is the plane exactly 70 miles from the airport?

Question

dude · Answer

Substitute 70 into d(x) (or just y) and solve for x

gilbertojgilv · Answer

no, its have to be an interception of time

gilbertojgilv · Answer

like this (a) between t = 6.06 and 8.44 min; 
(b) between t = 15.72 and 18.11 min.