Which of the following is the correct use of the Commutative Property of Multiplication? A. (2 · 7) · 8 = (7 · 2) · 8
B. (2 · 8) · 7 = 2 · (8 · 7)
C. 8(2 + 7) = 8 · 2 + 8 · 7
D. 8 · 2 · 1 = 8 · 2
THERE IS ONLY ONE CORRECT ANSWER

Find a parametrization for the curve「and determine the work done on a particle moving along γ in r3 through the force field f: r^3--r^3'where f(x,y,z) = (1,-x,z) and (a) im (γ) is the line segment from (0,0,0) to (1,2,1) (b) im (γ) is the polygonal curve with successive vertices (1,0,0), (0,1,1), and (2,2,2) (c) im (γ) is the unit circle in the plane z = 1 with center (0,0,1) beginning and ending at (1,0,1), and starting towards (0,1,1)