Try another version of this question Find the mass of the one-dimensional object. A pencil that is `12` in. long (starting at `x = 4`) and has a density function of `\rho(x) = 7/x` oz/in.
Box 1: Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Remember, for a one-dimensional object with variable density, we use integration to find the mass.
Enter DNE for Does Not Exist, oo for Infinity 9.7040605278392