Find the line integral of F = (3x^2 - 4x) i + 4z j + k from (0,0,0) to (1,1,1) over each of the following paths in the accompanying figure.
a. C1: r(t) = ti + tj + tk, 0 ≤ t ≤ 1
b. C2: r(t) = ti + t^2 j + t^4 k, 0 ≤ t ≤ 1
c. C3 U C4: the path consisting of the line segment from (0,0,0) to (1,1,0) followed by the segment from (1,1,0) to (1,1,1)
a. The line integral of F over C1 is