dx Assume x and y are functions of t. Evaluate for 2xy - 5x + 4y3 = - 152, with the conditions -+ = -8, X=4, y= - 3. dy dt (Type an exact answer in simplified form.)Find the relative rate of change of f(x) at the indicated value of x. f(x)=4405x;x=18 The relative rate of change of f(x) at x = 18 is . (Type an integer or decimal rounded to three decimal places as needed.) Find f' (x). f(x) = 5 e -2x f'(x) =Find f'(x) and find the equation of the line tangent to the graph of f at the indicated value of x. Find the value(s) of x where the tangent line is horizontal. f ( x) = In (4- 9x2 + 8x4 ) ; x=1 f' (x) = The equation of the line tangent to the graph of fat x = 1 is y =]. Select the correct choice below and fill in any answer boxes in your choice. O A. The value(s) of x where the tangent line is horizontal is/are (Simplify your answer. Use a comma to separate answers as needed.) O B. The tangent line is never horizontal