3 (1 point) Find the equation of the tangent line to the graph of y(x) = 8(x i) at x = 2 . Equation of the tangent line is y = :=: Round your constants to 3 decimal places if needed. (1 point) Let f(x) = (5x2 +7)3(-7x2 +9)-3 f' (x) =(1 point) Let -8x f(x) =. V7 - 4x f' ( x) =(1 point) A totalrevenue function is given by R(x) = 13001/x2 0.236 where R(x) is the total revenue, in thousands of dollars, from the sale ofx airplanes. Find the rate at which the total revenue is changing when 21 airplanes have been sold. 555 dollars per airplane. Round to two decimal places. (1 point) A total-cost function is given by C(x) = 1200(x2 + 5)\"3 + 700 where C(x) is the total cost, in thousands oi dollars, for the production of x airplanes. Find the rate at which the total cost is changing when 21 airplanes have been sold. ::: dollars per airplane. Round to two decimal places