What tribe were largely nomadic that relied on hunting and gathering to sustain life?

Imagine you are driving down the highway and reading a sign that states save the planet don't litter which technique of policy enactment is being used

Say a certain manufacturing industry has 63.1 thousand jobs in 2008, but is expected to decline at an average annual rate of 1.7 thousand jobs per year from 2008 to 2018. assuming this holds true, what will be this industry’s percent change from 2008 to 2018? a. 70% b. -27% c. -17% d. -75%

Where is sub-saharan africa located?