Does anyone know this ? it’s geometry and i have no clue how to do it !

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour. what is the cyclist average rate for the round trip in miles per hour ?

Need so much on this one how many yards?