differetial calculus-related rates

A wheel of a radius 30 centimeters revolves at a rate of 10 revolutions per second.A dot is painted at a point P on the rim of the wheel.
a)find dx/dt as a function of ϴ.
b)use a graphing utility to graph a function in part (a)
c)when is the absolute value of the rate of change of x greatest?when is it least?
d)find dx/dt when ϴ=30° and ϴ=60°

show all your solutions pls thanks

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