Please help! WILL BE MARKED BRAINLIEST!!

The density D of water is 3.12*10^-2 tons per cubic foot. The volume V in a lake is 4.266*10^14 cubic feet. Use the formula D=M/V to find the mass M (in tons) of the water in the lake using scientific notation.

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)