If a² + b² = 86 and ab = -16, find the value of (a - b)²

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

What can you learn about precipitation levels in south america from this map? brazil is experiencing a drought.it rains more in higher altitudes.peru received the highest level of rain.venezuela got less than 25 cm of rain. 

Hurricanes a. usually form over land b. usually intensify over land c. gain strength from ocean heat d. usually form over the poles