Worth 15 points please help.

You are a scientist who has been sent on a special mission to study plants and animals in south asia! your destination is an important forest in eastern india. you need to travel to 17°n latitude and 83°e longitude. which star should you travel to?

Solve for r in the formula v = ir, when i = 5 and v = 15.

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4