Problem 4: [20 pts] A thin wire that extends from a: = 0 to x = 3 and has density p(:c) = |222 2$| . Harper is asked to nd the mass of this Wire and provides the argument below. I know that mass 2 (density) x (length). Since the wire is 3 units long and p(3) 2 KS)2 7 2(3)| = 3, the mass is m 2 (3X3) 2 9 units. Determine if this argument is correct or incorrect. If it is incorrect, explain the error that Harper made, then calculate the mass correctly