Answer
Solutions: x=1.16
Work Step by Step
Using a graphing calculator to graph the function cos(x) = 0.4, and inputting lines x = 0 and x = $\pi$ to establish the interval of interest, we see that the only solution (x-intercept of cos(x) = 0.4) within the interval is x $\approx$ 1.159279. As the question wants the solution rounded to 2 decimal places, the solution is 1.16.