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help for math

The monthly sales of Sunny Electronics' new sound system are given by
q(t) = 2,000t − 90t2 units per month,
t months after its introduction. The price Sunny charges is
p(t) = 1,000 − t2 dollars
per sound system, t months after introduction. Find the rate of change of monthly sales. 
q'(t) =?


Find the rate of change of the price.
p'(t) =?



Find the rate of change of monthly revenue 5 months after the introduction of the sound system.
$ ? per month

Interpret your answer.
When t = ? , the revenue is increasing at a rate of $ ?per month.

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