Cindy saves $420 each month. her monthly salary is $2100. what is the ratio of the amount cindy saves to the amount she earns each month?
a) 1: 5
b) 1: 4
c) 2: 3
d) 5: 1

Plz help plz give me the answer

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

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)