Exactly how much dry sand, in pounds, would need to be added to a 55-gallon metal drum to make it sink? the empty drum weighs 40 lb.

Why might have people followed the rivers to find their way into asia

While most people who lived in ancient egypt and the middle east avoided settling in nearby deserts, those regions protected them from their enemies. why do you think this was true?

In the diagram below, ab and bc are tangent to o. what is the measure of