What is the 1st term of the geometric sequence defined in the table below?

n 3 8
an 112 –3584

hint: an = a1 × rn−1, where a1 is the first term and r is the common ratio.

a1=−2

a1=−12

a1=−28

a1=28

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)