HELP! If a train is traveling at an avergae rate, r= (2x^2-5x-3)/2x miles per hour, and covers a distance, d=6x^2+3x miles, calculate the time. Use d=rt or t= d/r

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