Ron is training for a marathon. he runs at 50% of his original training speed on monday, and at 4 miles per hour less than his original training speed on tuesday.

if the sum of his running speeds of the two days is 17 miles per hour, what was his original training speed?
6.51
14
21
8.67

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)