Question

explain why using gps and satellite technology is important to many african regions.
reduce crop yields
property lines in many african regions should be changed
over 70% of african people live off agriculture
find more rare earth materials to mine

Explanation:

GPS and satellite technology can help in better agricultural planning, monitoring, and management. Since over 70% of African people live off agriculture, this technology can significantly impact their livelihoods by improving crop yields (not reducing them), optimizing resource use, etc. The option about changing property lines is not a main positive reason for the importance. And finding rare earth materials is a more limited - scope use compared to the broad - based agricultural impact.

Answer:

Over 70% of African people live off agriculture