Linear Trig Equation Word Problem

[aeromat]

Homework Statement

Homework Equations

The Attempt at a Solution

The part I don't understand is what would be substituted (if anything) for the 24s? How will that be implemented to solve for the periods of time?

 

[Mark44]

You aren't supposed to substitute anything for the 24 seconds. That is the domain for t in this problem. The problem is asking, for what values of t in [0, 24], is h(t) < 0.

 

[aeromat]

Ok so you would just graph it and use symmetry analysis to pick out the intervals right? Symmetry meaning look for radians that are equivalent in their values.

 

[Mark44]

Graphing it would be a good start.

"Look for radians that are equivalent in their values." I don't know what that means.