A two way table shows information about pupils in a primary school
42 boys can count
58 girls can count
11 boys cannot count
9 girls cannot count
there are 53 boys
there are 67 girls
100 pupils can count
20 pupils cannot count
there are 120 pupils altogether
how many boys can count?
what is the probability that any pupil is a boy and can count?

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)