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2. Let q = f(p) be the number of skateboards sold at the price p (in $). Suppose we know that we sell 10,000 skateboards when the price is $140, and suppose f'(140) = 100. a) If R is the revenue, then nd a formula for R in terms of p and q. b) Find R'(140). 3. Find the equation of the tangent line at the point (1,1) of the curve 2:3 + 4.133,: ya = 4