Evaluate: 6 4e-2x dx OO O 2 O - 2 Question 18 2 pt Given a thin rod oriented along the x-axis over the interval [a, b], let p(x) denote a linear density function giving the density of the rod at a point x in the interval. Then the mass of the rod, m, is given by Om = Sep(x) dx Om = f dx Om = fp(x) dx Om = 1 p (I )