3 only with detailed solution

1. Find the length of arc of the curve y = -1 - In r from a = 1.5 to r = 2. 2. Set-up the integral for the area A( R) of the region R bounded by the circles y? + x2 = 4, and y' + x2 = 16, below the r-axis and to the right by the y-axis using the vertical strip. 3. If R is the region bounded by y = a' - 1 and y = -x2 - 1, find the volume V(S) of the solid S generated by revolving R about the indicated line a. I = -1 using vertical strip b. I = -1 using horizontal strip