Carl said that if he is older than you, then you must be 16. Is this conjecture always true never true or sometimes true? • always true
• never true
• sometimes true

How do north and central america differ

What major factors play a role in global warming? 1. human activity and normal climate conditions 2. natural factors and human activity 3. normal climate conditions and abnormal human activities 4. abnormal human activities and natural factors

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