Need help understanding

1. You have a long piece of 8-inch-wide metal which you are going to make into a gutter by bending up 3 inches on each side (Fig. 21). What angle will give the gutter which holds the most water (with the largest cross-sectional area)? 2 Fig. 21 2. Find the shortest distance from the point (2,0) to the curve: (a) y = 3x -1 (b)y= x 2 (c)x 2+y 2=1 3. Find the location of C in Fig. 30 so the sum of the distances from A to C and from C to B is a minimum. B pipe pipe h C X nVer L Fig. 30