Free points for those who can solve it.. if pqr=1,prove that:1/1+p+q^-1+1/1+q+r^-1+1/1+r+p^ -1 = 1

The number of calories you burn depends on your weight. a 110-pound person burns 163 calories during 30 minutes of tennis. find the number of calories that a 190-pound person would burn during the same activity, assuming they burn calories at the same rate.