1. Calculate the line integral of F = 67 - 7j along the line segment from (0, 0) to (7, 6). 2. Find [ F . dr, where F = 5i + 7] and C is the r-axis from (-1, 0) to (-9,0). 3. Calculate (23 +3k) . di, where C is the y-axis from the origin to (0, 10, 0)