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1. How do I find the length of an arc in a circle of radius 10 centimeters subtended by the central angle of


2.  How do I graph f(x) =x sin x  on [-4π, 4π] and verbalize how the graph varies from the graphs of f(x)= +x. 

3. How do I graph f(x) = sin x/x on the window [−5π, 5π] and describe freely what the graph shows.

4.  A 23-ft ladder leans against a building so that the angle between the ground and the ladder is 80°. How high does the ladder reach up the side of the building?

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