The graph of x] = 2):\"3 + 15x\"2 - 84): + 13 has two horizontal tangents. What is the negative value of x where a horizontal tangent occurs? W131: is the positive value of x where a horizontal tangent occurs? Suppose a product's revenue function is given by RM}: - 4:1\"2 + T0011. Find an expression for the marginal revenue function, simplify it, and record your result in the box below. Be sure to use the proper variable in your answer. [Use the preview button to check your syntax before submitting your answer.] MRqu] = Given that f {x}=x"' Shot] h{-1 1:3 h'(-1 1:5 Calculate f'II-1 }