8. [-/1 Points] DETAILS SCALCET9 5.4.073. MY NOT The linear density of a rod of length 4 meters is given by p(x) = 5 + 7vx measured in kilograms per meter, where x is measured in meters from one end of the rod. Find the total mass (in kg) of the rod. kg5. [l1 Points] DETAILS SCALCETQ 5.4.058. The boundaries of the shaded region are the yaxis, the line y = 1, and the curve 1! = 33/}. y Find the area of the region R by writing X as a function of y and integrating with respect to 3/.