Find a linear differential operator that annihilates the given function. (Use D for the differential operator.) 7x − sin(x) + 20 cos(5x)

An astronaut drops a rock into a crater on the moon. the distance, d(t), in meters, the rock travels after t seconds can be modeled by the function d(t)0.82. what is the average speed, in meters per second, of the rock between 5 and 10 seconds after it was dropped?

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In the 30-60-90 triangle below side s has a length of and side r has a length