What causes the population density of the United Kingdom to be much greater than the population density of Russia?
A. The United Kingdom is much larger than Russia
B. The climate of the United Kingdom is much colder than Russia
C. Russia has more natural resources than the United Kingdom
D. Russia is a huge country and the United Kingdom is a small island

Express -5 2/5 as an improper fraction.

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)

Type the next three numbers in a sequence 80, 90, 85, 95, 90, 100, 95, 105