The football team gained 1111 yards on the first play and lost 2020 yards on the second play. how many yards did the team gain or lose in all

The football team gained 11 yds on the first play and lost 20 yds on the second play.
So the team lost (11 - 20) = -9they lost 9 yds in all

The mechanical effects of using cervical and lumbar traction include: stretching of ligament and joint capsules, stretching of spinal and paraspinal muscles, increased separation of the auricular facet joints, and relieved pressure in nerves and nerve roots.