3. Deborah decided to mow lawns to earn the $280
she needs for a school orchestra trip. If she earns
$18 per lawn, what is the minimum number of
lawns she needs to mow to earn the money for the
trip?
A. 15
B. 16
C. 18
D. 20

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)