In the following exercises, identify the roots of the integrand to remove absolute values, then evaluate using the Fundamental Theorem of Calculus, π/2
∫ | sin t | dt
−π/2

Cheryl works as a hotel maid. the number of hotel rooms she cleans is directly proportional to the number of hours she works. the graph shows that r rooms are cleaned in t hours. using the graph below answer the following questions under it